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• What Is a Case Study? | Definition, Examples & Methods

What Is a Case Study? | Definition, Examples & Methods

Published on May 8, 2019 by Shona McCombes . Revised on November 20, 2023.

A case study is a detailed study of a specific subject, such as a person, group, place, event, organization, or phenomenon. Case studies are commonly used in social, educational, clinical, and business research.

A case study research design usually involves qualitative methods , but quantitative methods are sometimes also used. Case studies are good for describing , comparing, evaluating and understanding different aspects of a research problem .

Table of contents

When to do a case study, step 1: select a case, step 2: build a theoretical framework, step 3: collect your data, step 4: describe and analyze the case, other interesting articles.

A case study is an appropriate research design when you want to gain concrete, contextual, in-depth knowledge about a specific real-world subject. It allows you to explore the key characteristics, meanings, and implications of the case.

Case studies are often a good choice in a thesis or dissertation . They keep your project focused and manageable when you don’t have the time or resources to do large-scale research.

You might use just one complex case study where you explore a single subject in depth, or conduct multiple case studies to compare and illuminate different aspects of your research problem.

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Once you have developed your problem statement and research questions , you should be ready to choose the specific case that you want to focus on. A good case study should have the potential to:

• Provide new or unexpected insights into the subject
• Challenge or complicate existing assumptions and theories
• Propose practical courses of action to resolve a problem
• Open up new directions for future research

TipIf your research is more practical in nature and aims to simultaneously investigate an issue as you solve it, consider conducting action research instead.

Unlike quantitative or experimental research , a strong case study does not require a random or representative sample. In fact, case studies often deliberately focus on unusual, neglected, or outlying cases which may shed new light on the research problem.

Example of an outlying case studyIn the 1960s the town of Roseto, Pennsylvania was discovered to have extremely low rates of heart disease compared to the US average. It became an important case study for understanding previously neglected causes of heart disease.

However, you can also choose a more common or representative case to exemplify a particular category, experience or phenomenon.

Example of a representative case studyIn the 1920s, two sociologists used Muncie, Indiana as a case study of a typical American city that supposedly exemplified the changing culture of the US at the time.

While case studies focus more on concrete details than general theories, they should usually have some connection with theory in the field. This way the case study is not just an isolated description, but is integrated into existing knowledge about the topic. It might aim to:

• Exemplify a theory by showing how it explains the case under investigation
• Expand on a theory by uncovering new concepts and ideas that need to be incorporated
• Challenge a theory by exploring an outlier case that doesn’t fit with established assumptions

To ensure that your analysis of the case has a solid academic grounding, you should conduct a literature review of sources related to the topic and develop a theoretical framework . This means identifying key concepts and theories to guide your analysis and interpretation.

There are many different research methods you can use to collect data on your subject. Case studies tend to focus on qualitative data using methods such as interviews , observations , and analysis of primary and secondary sources (e.g., newspaper articles, photographs, official records). Sometimes a case study will also collect quantitative data.

Example of a mixed methods case studyFor a case study of a wind farm development in a rural area, you could collect quantitative data on employment rates and business revenue, collect qualitative data on local people’s perceptions and experiences, and analyze local and national media coverage of the development.

The aim is to gain as thorough an understanding as possible of the case and its context.

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In writing up the case study, you need to bring together all the relevant aspects to give as complete a picture as possible of the subject.

How you report your findings depends on the type of research you are doing. Some case studies are structured like a standard scientific paper or thesis , with separate sections or chapters for the methods , results and discussion .

Others are written in a more narrative style, aiming to explore the case from various angles and analyze its meanings and implications (for example, by using textual analysis or discourse analysis ).

In all cases, though, make sure to give contextual details about the case, connect it back to the literature and theory, and discuss how it fits into wider patterns or debates.

If you want to know more about statistics , methodology , or research bias , make sure to check out some of our other articles with explanations and examples.

• Normal distribution
• Degrees of freedom
• Null hypothesis
• Discourse analysis
• Control groups
• Mixed methods research
• Non-probability sampling
• Quantitative research
• Ecological validity

Research bias

• Rosenthal effect
• Implicit bias
• Cognitive bias
• Selection bias
• Negativity bias
• Status quo bias

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Home » Case Study – Methods, Examples and Guide

Case Study – Methods, Examples and Guide

Table of Contents

A case study is a research method that involves an in-depth examination and analysis of a particular phenomenon or case, such as an individual, organization, community, event, or situation.

It is a qualitative research approach that aims to provide a detailed and comprehensive understanding of the case being studied. Case studies typically involve multiple sources of data, including interviews, observations, documents, and artifacts, which are analyzed using various techniques, such as content analysis, thematic analysis, and grounded theory. The findings of a case study are often used to develop theories, inform policy or practice, or generate new research questions.

Types of Case Study

Types and Methods of Case Study are as follows:

Single-Case Study

A single-case study is an in-depth analysis of a single case. This type of case study is useful when the researcher wants to understand a specific phenomenon in detail.

For Example , A researcher might conduct a single-case study on a particular individual to understand their experiences with a particular health condition or a specific organization to explore their management practices. The researcher collects data from multiple sources, such as interviews, observations, and documents, and uses various techniques to analyze the data, such as content analysis or thematic analysis. The findings of a single-case study are often used to generate new research questions, develop theories, or inform policy or practice.

Multiple-Case Study

A multiple-case study involves the analysis of several cases that are similar in nature. This type of case study is useful when the researcher wants to identify similarities and differences between the cases.

For Example, a researcher might conduct a multiple-case study on several companies to explore the factors that contribute to their success or failure. The researcher collects data from each case, compares and contrasts the findings, and uses various techniques to analyze the data, such as comparative analysis or pattern-matching. The findings of a multiple-case study can be used to develop theories, inform policy or practice, or generate new research questions.

Exploratory Case Study

An exploratory case study is used to explore a new or understudied phenomenon. This type of case study is useful when the researcher wants to generate hypotheses or theories about the phenomenon.

For Example, a researcher might conduct an exploratory case study on a new technology to understand its potential impact on society. The researcher collects data from multiple sources, such as interviews, observations, and documents, and uses various techniques to analyze the data, such as grounded theory or content analysis. The findings of an exploratory case study can be used to generate new research questions, develop theories, or inform policy or practice.

Descriptive Case Study

A descriptive case study is used to describe a particular phenomenon in detail. This type of case study is useful when the researcher wants to provide a comprehensive account of the phenomenon.

For Example, a researcher might conduct a descriptive case study on a particular community to understand its social and economic characteristics. The researcher collects data from multiple sources, such as interviews, observations, and documents, and uses various techniques to analyze the data, such as content analysis or thematic analysis. The findings of a descriptive case study can be used to inform policy or practice or generate new research questions.

Instrumental Case Study

An instrumental case study is used to understand a particular phenomenon that is instrumental in achieving a particular goal. This type of case study is useful when the researcher wants to understand the role of the phenomenon in achieving the goal.

For Example, a researcher might conduct an instrumental case study on a particular policy to understand its impact on achieving a particular goal, such as reducing poverty. The researcher collects data from multiple sources, such as interviews, observations, and documents, and uses various techniques to analyze the data, such as content analysis or thematic analysis. The findings of an instrumental case study can be used to inform policy or practice or generate new research questions.

Case Study Data Collection Methods

Here are some common data collection methods for case studies:

Interviews involve asking questions to individuals who have knowledge or experience relevant to the case study. Interviews can be structured (where the same questions are asked to all participants) or unstructured (where the interviewer follows up on the responses with further questions). Interviews can be conducted in person, over the phone, or through video conferencing.

Observations

Observations involve watching and recording the behavior and activities of individuals or groups relevant to the case study. Observations can be participant (where the researcher actively participates in the activities) or non-participant (where the researcher observes from a distance). Observations can be recorded using notes, audio or video recordings, or photographs.

Documents can be used as a source of information for case studies. Documents can include reports, memos, emails, letters, and other written materials related to the case study. Documents can be collected from the case study participants or from public sources.

Surveys involve asking a set of questions to a sample of individuals relevant to the case study. Surveys can be administered in person, over the phone, through mail or email, or online. Surveys can be used to gather information on attitudes, opinions, or behaviors related to the case study.

Artifacts are physical objects relevant to the case study. Artifacts can include tools, equipment, products, or other objects that provide insights into the case study phenomenon.

How to conduct Case Study Research

Conducting a case study research involves several steps that need to be followed to ensure the quality and rigor of the study. Here are the steps to conduct case study research:

• Define the research questions: The first step in conducting a case study research is to define the research questions. The research questions should be specific, measurable, and relevant to the case study phenomenon under investigation.
• Select the case: The next step is to select the case or cases to be studied. The case should be relevant to the research questions and should provide rich and diverse data that can be used to answer the research questions.
• Collect data: Data can be collected using various methods, such as interviews, observations, documents, surveys, and artifacts. The data collection method should be selected based on the research questions and the nature of the case study phenomenon.
• Analyze the data: The data collected from the case study should be analyzed using various techniques, such as content analysis, thematic analysis, or grounded theory. The analysis should be guided by the research questions and should aim to provide insights and conclusions relevant to the research questions.
• Draw conclusions: The conclusions drawn from the case study should be based on the data analysis and should be relevant to the research questions. The conclusions should be supported by evidence and should be clearly stated.
• Validate the findings: The findings of the case study should be validated by reviewing the data and the analysis with participants or other experts in the field. This helps to ensure the validity and reliability of the findings.
• Write the report: The final step is to write the report of the case study research. The report should provide a clear description of the case study phenomenon, the research questions, the data collection methods, the data analysis, the findings, and the conclusions. The report should be written in a clear and concise manner and should follow the guidelines for academic writing.

Examples of Case Study

Here are some examples of case study research:

• The Hawthorne Studies : Conducted between 1924 and 1932, the Hawthorne Studies were a series of case studies conducted by Elton Mayo and his colleagues to examine the impact of work environment on employee productivity. The studies were conducted at the Hawthorne Works plant of the Western Electric Company in Chicago and included interviews, observations, and experiments.
• The Stanford Prison Experiment: Conducted in 1971, the Stanford Prison Experiment was a case study conducted by Philip Zimbardo to examine the psychological effects of power and authority. The study involved simulating a prison environment and assigning participants to the role of guards or prisoners. The study was controversial due to the ethical issues it raised.
• The Challenger Disaster: The Challenger Disaster was a case study conducted to examine the causes of the Space Shuttle Challenger explosion in 1986. The study included interviews, observations, and analysis of data to identify the technical, organizational, and cultural factors that contributed to the disaster.
• The Enron Scandal: The Enron Scandal was a case study conducted to examine the causes of the Enron Corporation’s bankruptcy in 2001. The study included interviews, analysis of financial data, and review of documents to identify the accounting practices, corporate culture, and ethical issues that led to the company’s downfall.
• The Fukushima Nuclear Disaster : The Fukushima Nuclear Disaster was a case study conducted to examine the causes of the nuclear accident that occurred at the Fukushima Daiichi Nuclear Power Plant in Japan in 2011. The study included interviews, analysis of data, and review of documents to identify the technical, organizational, and cultural factors that contributed to the disaster.

Application of Case Study

Case studies have a wide range of applications across various fields and industries. Here are some examples:

Business and Management

Case studies are widely used in business and management to examine real-life situations and develop problem-solving skills. Case studies can help students and professionals to develop a deep understanding of business concepts, theories, and best practices.

Case studies are used in healthcare to examine patient care, treatment options, and outcomes. Case studies can help healthcare professionals to develop critical thinking skills, diagnose complex medical conditions, and develop effective treatment plans.

Case studies are used in education to examine teaching and learning practices. Case studies can help educators to develop effective teaching strategies, evaluate student progress, and identify areas for improvement.

Social Sciences

Case studies are widely used in social sciences to examine human behavior, social phenomena, and cultural practices. Case studies can help researchers to develop theories, test hypotheses, and gain insights into complex social issues.

Law and Ethics

Case studies are used in law and ethics to examine legal and ethical dilemmas. Case studies can help lawyers, policymakers, and ethical professionals to develop critical thinking skills, analyze complex cases, and make informed decisions.

Purpose of Case Study

The purpose of a case study is to provide a detailed analysis of a specific phenomenon, issue, or problem in its real-life context. A case study is a qualitative research method that involves the in-depth exploration and analysis of a particular case, which can be an individual, group, organization, event, or community.

The primary purpose of a case study is to generate a comprehensive and nuanced understanding of the case, including its history, context, and dynamics. Case studies can help researchers to identify and examine the underlying factors, processes, and mechanisms that contribute to the case and its outcomes. This can help to develop a more accurate and detailed understanding of the case, which can inform future research, practice, or policy.

Case studies can also serve other purposes, including:

• Illustrating a theory or concept: Case studies can be used to illustrate and explain theoretical concepts and frameworks, providing concrete examples of how they can be applied in real-life situations.
• Developing hypotheses: Case studies can help to generate hypotheses about the causal relationships between different factors and outcomes, which can be tested through further research.
• Providing insight into complex issues: Case studies can provide insights into complex and multifaceted issues, which may be difficult to understand through other research methods.
• Informing practice or policy: Case studies can be used to inform practice or policy by identifying best practices, lessons learned, or areas for improvement.

Advantages of Case Study Research

There are several advantages of case study research, including:

• In-depth exploration: Case study research allows for a detailed exploration and analysis of a specific phenomenon, issue, or problem in its real-life context. This can provide a comprehensive understanding of the case and its dynamics, which may not be possible through other research methods.
• Rich data: Case study research can generate rich and detailed data, including qualitative data such as interviews, observations, and documents. This can provide a nuanced understanding of the case and its complexity.
• Holistic perspective: Case study research allows for a holistic perspective of the case, taking into account the various factors, processes, and mechanisms that contribute to the case and its outcomes. This can help to develop a more accurate and comprehensive understanding of the case.
• Theory development: Case study research can help to develop and refine theories and concepts by providing empirical evidence and concrete examples of how they can be applied in real-life situations.
• Practical application: Case study research can inform practice or policy by identifying best practices, lessons learned, or areas for improvement.
• Contextualization: Case study research takes into account the specific context in which the case is situated, which can help to understand how the case is influenced by the social, cultural, and historical factors of its environment.

Limitations of Case Study Research

There are several limitations of case study research, including:

• Limited generalizability : Case studies are typically focused on a single case or a small number of cases, which limits the generalizability of the findings. The unique characteristics of the case may not be applicable to other contexts or populations, which may limit the external validity of the research.
• Biased sampling: Case studies may rely on purposive or convenience sampling, which can introduce bias into the sample selection process. This may limit the representativeness of the sample and the generalizability of the findings.
• Subjectivity: Case studies rely on the interpretation of the researcher, which can introduce subjectivity into the analysis. The researcher’s own biases, assumptions, and perspectives may influence the findings, which may limit the objectivity of the research.
• Limited control: Case studies are typically conducted in naturalistic settings, which limits the control that the researcher has over the environment and the variables being studied. This may limit the ability to establish causal relationships between variables.
• Time-consuming: Case studies can be time-consuming to conduct, as they typically involve a detailed exploration and analysis of a specific case. This may limit the feasibility of conducting multiple case studies or conducting case studies in a timely manner.
• Resource-intensive: Case studies may require significant resources, including time, funding, and expertise. This may limit the ability of researchers to conduct case studies in resource-constrained settings.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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The Ultimate Guide to Qualitative Research - Part 1: The Basics

• Introduction and overview
• What is qualitative research?
• What is qualitative data?
• Examples of qualitative data
• Qualitative vs. quantitative research
• Mixed methods
• Qualitative research preparation
• Theoretical perspective
• Theoretical framework
• Literature reviews

Research question

• Conceptual framework
• Conceptual vs. theoretical framework

Data collection

• Qualitative research methods
• Focus groups
• Observational research

What is a case study?

Applications for case study research, what is a good case study, process of case study design, benefits and limitations of case studies.

• Ethnographical research
• Ethical considerations
• Confidentiality and privacy
• Power dynamics
• Reflexivity

Case studies

Case studies are essential to qualitative research , offering a lens through which researchers can investigate complex phenomena within their real-life contexts. This chapter explores the concept, purpose, applications, examples, and types of case studies and provides guidance on how to conduct case study research effectively.

Whereas quantitative methods look at phenomena at scale, case study research looks at a concept or phenomenon in considerable detail. While analyzing a single case can help understand one perspective regarding the object of research inquiry, analyzing multiple cases can help obtain a more holistic sense of the topic or issue. Let's provide a basic definition of a case study, then explore its characteristics and role in the qualitative research process.

Definition of a case study

A case study in qualitative research is a strategy of inquiry that involves an in-depth investigation of a phenomenon within its real-world context. It provides researchers with the opportunity to acquire an in-depth understanding of intricate details that might not be as apparent or accessible through other methods of research. The specific case or cases being studied can be a single person, group, or organization – demarcating what constitutes a relevant case worth studying depends on the researcher and their research question .

Among qualitative research methods , a case study relies on multiple sources of evidence, such as documents, artifacts, interviews , or observations , to present a complete and nuanced understanding of the phenomenon under investigation. The objective is to illuminate the readers' understanding of the phenomenon beyond its abstract statistical or theoretical explanations.

Characteristics of case studies

Case studies typically possess a number of distinct characteristics that set them apart from other research methods. These characteristics include a focus on holistic description and explanation, flexibility in the design and data collection methods, reliance on multiple sources of evidence, and emphasis on the context in which the phenomenon occurs.

Furthermore, case studies can often involve a longitudinal examination of the case, meaning they study the case over a period of time. These characteristics allow case studies to yield comprehensive, in-depth, and richly contextualized insights about the phenomenon of interest.

The role of case studies in research

Case studies hold a unique position in the broader landscape of research methods aimed at theory development. They are instrumental when the primary research interest is to gain an intensive, detailed understanding of a phenomenon in its real-life context.

In addition, case studies can serve different purposes within research - they can be used for exploratory, descriptive, or explanatory purposes, depending on the research question and objectives. This flexibility and depth make case studies a valuable tool in the toolkit of qualitative researchers.

Remember, a well-conducted case study can offer a rich, insightful contribution to both academic and practical knowledge through theory development or theory verification, thus enhancing our understanding of complex phenomena in their real-world contexts.

What is the purpose of a case study?

Case study research aims for a more comprehensive understanding of phenomena, requiring various research methods to gather information for qualitative analysis . Ultimately, a case study can allow the researcher to gain insight into a particular object of inquiry and develop a theoretical framework relevant to the research inquiry.

Why use case studies in qualitative research?

Using case studies as a research strategy depends mainly on the nature of the research question and the researcher's access to the data.

Conducting case study research provides a level of detail and contextual richness that other research methods might not offer. They are beneficial when there's a need to understand complex social phenomena within their natural contexts.

The explanatory, exploratory, and descriptive roles of case studies

Case studies can take on various roles depending on the research objectives. They can be exploratory when the research aims to discover new phenomena or define new research questions; they are descriptive when the objective is to depict a phenomenon within its context in a detailed manner; and they can be explanatory if the goal is to understand specific relationships within the studied context. Thus, the versatility of case studies allows researchers to approach their topic from different angles, offering multiple ways to uncover and interpret the data .

The impact of case studies on knowledge development

Case studies play a significant role in knowledge development across various disciplines. Analysis of cases provides an avenue for researchers to explore phenomena within their context based on the collected data.

This can result in the production of rich, practical insights that can be instrumental in both theory-building and practice. Case studies allow researchers to delve into the intricacies and complexities of real-life situations, uncovering insights that might otherwise remain hidden.

Types of case studies

In qualitative research , a case study is not a one-size-fits-all approach. Depending on the nature of the research question and the specific objectives of the study, researchers might choose to use different types of case studies. These types differ in their focus, methodology, and the level of detail they provide about the phenomenon under investigation.

Understanding these types is crucial for selecting the most appropriate approach for your research project and effectively achieving your research goals. Let's briefly look at the main types of case studies.

Exploratory case studies

Exploratory case studies are typically conducted to develop a theory or framework around an understudied phenomenon. They can also serve as a precursor to a larger-scale research project. Exploratory case studies are useful when a researcher wants to identify the key issues or questions which can spur more extensive study or be used to develop propositions for further research. These case studies are characterized by flexibility, allowing researchers to explore various aspects of a phenomenon as they emerge, which can also form the foundation for subsequent studies.

Descriptive case studies

Descriptive case studies aim to provide a complete and accurate representation of a phenomenon or event within its context. These case studies are often based on an established theoretical framework, which guides how data is collected and analyzed. The researcher is concerned with describing the phenomenon in detail, as it occurs naturally, without trying to influence or manipulate it.

Explanatory case studies

Explanatory case studies are focused on explanation - they seek to clarify how or why certain phenomena occur. Often used in complex, real-life situations, they can be particularly valuable in clarifying causal relationships among concepts and understanding the interplay between different factors within a specific context.

Intrinsic, instrumental, and collective case studies

These three categories of case studies focus on the nature and purpose of the study. An intrinsic case study is conducted when a researcher has an inherent interest in the case itself. Instrumental case studies are employed when the case is used to provide insight into a particular issue or phenomenon. A collective case study, on the other hand, involves studying multiple cases simultaneously to investigate some general phenomena.

Each type of case study serves a different purpose and has its own strengths and challenges. The selection of the type should be guided by the research question and objectives, as well as the context and constraints of the research.

The flexibility, depth, and contextual richness offered by case studies make this approach an excellent research method for various fields of study. They enable researchers to investigate real-world phenomena within their specific contexts, capturing nuances that other research methods might miss. Across numerous fields, case studies provide valuable insights into complex issues.

Critical information systems research

Case studies provide a detailed understanding of the role and impact of information systems in different contexts. They offer a platform to explore how information systems are designed, implemented, and used and how they interact with various social, economic, and political factors. Case studies in this field often focus on examining the intricate relationship between technology, organizational processes, and user behavior, helping to uncover insights that can inform better system design and implementation.

Health research

Health research is another field where case studies are highly valuable. They offer a way to explore patient experiences, healthcare delivery processes, and the impact of various interventions in a real-world context.

Case studies can provide a deep understanding of a patient's journey, giving insights into the intricacies of disease progression, treatment effects, and the psychosocial aspects of health and illness.

Asthma research studies

Specifically within medical research, studies on asthma often employ case studies to explore the individual and environmental factors that influence asthma development, management, and outcomes. A case study can provide rich, detailed data about individual patients' experiences, from the triggers and symptoms they experience to the effectiveness of various management strategies. This can be crucial for developing patient-centered asthma care approaches.

Other fields

Apart from the fields mentioned, case studies are also extensively used in business and management research, education research, and political sciences, among many others. They provide an opportunity to delve into the intricacies of real-world situations, allowing for a comprehensive understanding of various phenomena.

Case studies, with their depth and contextual focus, offer unique insights across these varied fields. They allow researchers to illuminate the complexities of real-life situations, contributing to both theory and practice.

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Understanding the key elements of case study design is crucial for conducting rigorous and impactful case study research. A well-structured design guides the researcher through the process, ensuring that the study is methodologically sound and its findings are reliable and valid. The main elements of case study design include the research question , propositions, units of analysis, and the logic linking the data to the propositions.

The research question is the foundation of any research study. A good research question guides the direction of the study and informs the selection of the case, the methods of collecting data, and the analysis techniques. A well-formulated research question in case study research is typically clear, focused, and complex enough to merit further detailed examination of the relevant case(s).

Propositions

Propositions, though not necessary in every case study, provide a direction by stating what we might expect to find in the data collected. They guide how data is collected and analyzed by helping researchers focus on specific aspects of the case. They are particularly important in explanatory case studies, which seek to understand the relationships among concepts within the studied phenomenon.

Units of analysis

The unit of analysis refers to the case, or the main entity or entities that are being analyzed in the study. In case study research, the unit of analysis can be an individual, a group, an organization, a decision, an event, or even a time period. It's crucial to clearly define the unit of analysis, as it shapes the qualitative data analysis process by allowing the researcher to analyze a particular case and synthesize analysis across multiple case studies to draw conclusions.

Argumentation

This refers to the inferential model that allows researchers to draw conclusions from the data. The researcher needs to ensure that there is a clear link between the data, the propositions (if any), and the conclusions drawn. This argumentation is what enables the researcher to make valid and credible inferences about the phenomenon under study.

Understanding and carefully considering these elements in the design phase of a case study can significantly enhance the quality of the research. It can help ensure that the study is methodologically sound and its findings contribute meaningful insights about the case.

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Conducting a case study involves several steps, from defining the research question and selecting the case to collecting and analyzing data . This section outlines these key stages, providing a practical guide on how to conduct case study research.

Defining the research question

The first step in case study research is defining a clear, focused research question. This question should guide the entire research process, from case selection to analysis. It's crucial to ensure that the research question is suitable for a case study approach. Typically, such questions are exploratory or descriptive in nature and focus on understanding a phenomenon within its real-life context.

Selecting and defining the case

The selection of the case should be based on the research question and the objectives of the study. It involves choosing a unique example or a set of examples that provide rich, in-depth data about the phenomenon under investigation. After selecting the case, it's crucial to define it clearly, setting the boundaries of the case, including the time period and the specific context.

Previous research can help guide the case study design. When considering a case study, an example of a case could be taken from previous case study research and used to define cases in a new research inquiry. Considering recently published examples can help understand how to select and define cases effectively.

Developing a detailed case study protocol

A case study protocol outlines the procedures and general rules to be followed during the case study. This includes the data collection methods to be used, the sources of data, and the procedures for analysis. Having a detailed case study protocol ensures consistency and reliability in the study.

The protocol should also consider how to work with the people involved in the research context to grant the research team access to collecting data. As mentioned in previous sections of this guide, establishing rapport is an essential component of qualitative research as it shapes the overall potential for collecting and analyzing data.

Collecting data

Gathering data in case study research often involves multiple sources of evidence, including documents, archival records, interviews, observations, and physical artifacts. This allows for a comprehensive understanding of the case. The process for gathering data should be systematic and carefully documented to ensure the reliability and validity of the study.

Analyzing and interpreting data

The next step is analyzing the data. This involves organizing the data , categorizing it into themes or patterns , and interpreting these patterns to answer the research question. The analysis might also involve comparing the findings with prior research or theoretical propositions.

Writing the case study report

The final step is writing the case study report . This should provide a detailed description of the case, the data, the analysis process, and the findings. The report should be clear, organized, and carefully written to ensure that the reader can understand the case and the conclusions drawn from it.

Each of these steps is crucial in ensuring that the case study research is rigorous, reliable, and provides valuable insights about the case.

The type, depth, and quality of data in your study can significantly influence the validity and utility of the study. In case study research, data is usually collected from multiple sources to provide a comprehensive and nuanced understanding of the case. This section will outline the various methods of collecting data used in case study research and discuss considerations for ensuring the quality of the data.

Interviews are a common method of gathering data in case study research. They can provide rich, in-depth data about the perspectives, experiences, and interpretations of the individuals involved in the case. Interviews can be structured , semi-structured , or unstructured , depending on the research question and the degree of flexibility needed.

Observations

Observations involve the researcher observing the case in its natural setting, providing first-hand information about the case and its context. Observations can provide data that might not be revealed in interviews or documents, such as non-verbal cues or contextual information.

Documents and artifacts

Documents and archival records provide a valuable source of data in case study research. They can include reports, letters, memos, meeting minutes, email correspondence, and various public and private documents related to the case.

These records can provide historical context, corroborate evidence from other sources, and offer insights into the case that might not be apparent from interviews or observations.

Physical artifacts refer to any physical evidence related to the case, such as tools, products, or physical environments. These artifacts can provide tangible insights into the case, complementing the data gathered from other sources.

Ensuring the quality of data collection

Determining the quality of data in case study research requires careful planning and execution. It's crucial to ensure that the data is reliable, accurate, and relevant to the research question. This involves selecting appropriate methods of collecting data, properly training interviewers or observers, and systematically recording and storing the data. It also includes considering ethical issues related to collecting and handling data, such as obtaining informed consent and ensuring the privacy and confidentiality of the participants.

Data analysis

Analyzing case study research involves making sense of the rich, detailed data to answer the research question. This process can be challenging due to the volume and complexity of case study data. However, a systematic and rigorous approach to analysis can ensure that the findings are credible and meaningful. This section outlines the main steps and considerations in analyzing data in case study research.

Organizing the data

The first step in the analysis is organizing the data. This involves sorting the data into manageable sections, often according to the data source or the theme. This step can also involve transcribing interviews, digitizing physical artifacts, or organizing observational data.

Categorizing and coding the data

Once the data is organized, the next step is to categorize or code the data. This involves identifying common themes, patterns, or concepts in the data and assigning codes to relevant data segments. Coding can be done manually or with the help of software tools, and in either case, qualitative analysis software can greatly facilitate the entire coding process. Coding helps to reduce the data to a set of themes or categories that can be more easily analyzed.

Identifying patterns and themes

After coding the data, the researcher looks for patterns or themes in the coded data. This involves comparing and contrasting the codes and looking for relationships or patterns among them. The identified patterns and themes should help answer the research question.

Interpreting the data

Once patterns and themes have been identified, the next step is to interpret these findings. This involves explaining what the patterns or themes mean in the context of the research question and the case. This interpretation should be grounded in the data, but it can also involve drawing on theoretical concepts or prior research.

Verification of the data

The last step in the analysis is verification. This involves checking the accuracy and consistency of the analysis process and confirming that the findings are supported by the data. This can involve re-checking the original data, checking the consistency of codes, or seeking feedback from research participants or peers.

Like any research method , case study research has its strengths and limitations. Researchers must be aware of these, as they can influence the design, conduct, and interpretation of the study.

Understanding the strengths and limitations of case study research can also guide researchers in deciding whether this approach is suitable for their research question . This section outlines some of the key strengths and limitations of case study research.

Benefits include the following:

• Rich, detailed data: One of the main strengths of case study research is that it can generate rich, detailed data about the case. This can provide a deep understanding of the case and its context, which can be valuable in exploring complex phenomena.
• Flexibility: Case study research is flexible in terms of design , data collection , and analysis . A sufficient degree of flexibility allows the researcher to adapt the study according to the case and the emerging findings.
• Real-world context: Case study research involves studying the case in its real-world context, which can provide valuable insights into the interplay between the case and its context.
• Multiple sources of evidence: Case study research often involves collecting data from multiple sources , which can enhance the robustness and validity of the findings.

On the other hand, researchers should consider the following limitations:

• Generalizability: A common criticism of case study research is that its findings might not be generalizable to other cases due to the specificity and uniqueness of each case.
• Time and resource intensive: Case study research can be time and resource intensive due to the depth of the investigation and the amount of collected data.
• Complexity of analysis: The rich, detailed data generated in case study research can make analyzing the data challenging.
• Subjectivity: Given the nature of case study research, there may be a higher degree of subjectivity in interpreting the data , so researchers need to reflect on this and transparently convey to audiences how the research was conducted.

Being aware of these strengths and limitations can help researchers design and conduct case study research effectively and interpret and report the findings appropriately.

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What is a Case Study? Definition & Examples

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Case Study Definition

A case study is an in-depth investigation of a single person, group, event, or community. This research method involves intensively analyzing a subject to understand its complexity and context. The richness of a case study comes from its ability to capture detailed, qualitative data that can offer insights into a process or subject matter that other research methods might miss.

A case study strives for a holistic understanding of events or situations by examining all relevant variables. They are ideal for exploring ‘how’ or ‘why’ questions in contexts where the researcher has limited control over events in real-life settings. Unlike narrowly focused experiments, these projects seek a comprehensive understanding of events or situations.

In a case study, researchers gather data through various methods such as participant observation, interviews, tests, record examinations, and writing samples. Unlike statistically-based studies that seek only quantifiable data, a case study attempts to uncover new variables and pose questions for subsequent research.

A case study is particularly beneficial when your research:

• Requires a deep, contextual understanding of a specific case.
• Needs to explore or generate hypotheses rather than test them.
• Focuses on a contemporary phenomenon within a real-life context.

Learn more about Other Types of Experimental Design .

Case Study Examples

Various fields utilize case studies, including the following:

• Social sciences : For understanding complex social phenomena.
• Business : For analyzing corporate strategies and business decisions.
• Healthcare : For detailed patient studies and medical research.
• Education : For understanding educational methods and policies.
• Law : For in-depth analysis of legal cases.

For example, consider a case study in a business setting where a startup struggles to scale. Researchers might examine the startup’s strategies, market conditions, management decisions, and competition. Interviews with the CEO, employees, and customers, alongside an analysis of financial data, could offer insights into the challenges and potential solutions for the startup. This research could serve as a valuable lesson for other emerging businesses.

See below for other examples.

Types of Case Studies

Several standard types of case studies exist that vary based on the objectives and specific research needs.

Illustrative Case Study : Descriptive in nature, these studies use one or two instances to depict a situation, helping to familiarize the unfamiliar and establish a common understanding of the topic.

Exploratory Case Study : Conducted as precursors to large-scale investigations, they assist in raising relevant questions, choosing measurement types, and identifying hypotheses to test.

Cumulative Case Study : These studies compile information from various sources over time to enhance generalization without the need for costly, repetitive new studies.

Critical Instance Case Study : Focused on specific sites, they either explore unique situations with limited generalizability or challenge broad assertions, to identify potential cause-and-effect issues.

Pros and Cons

As with any research study, case studies have a set of benefits and drawbacks.

• Provides comprehensive and detailed data.
• Offers a real-life perspective.
• Flexible and can adapt to discoveries during the study.
• Enables investigation of scenarios that are hard to assess in laboratory settings.
• Facilitates studying rare or unique cases.
• Generates hypotheses for future experimental research.
• Time-consuming and may require a lot of resources.
• Hard to generalize findings to a broader context.
• Potential for researcher bias.
• Cannot establish causality .
• Lacks scientific rigor compared to more controlled research methods .

Crafting a Good Case Study: Methodology

While case studies emphasize specific details over broad theories, they should connect to theoretical frameworks in the field. This approach ensures that these projects contribute to the existing body of knowledge on the subject, rather than standing as an isolated entity.

The following are critical steps in developing a case study:

• Define the Research Questions : Clearly outline what you want to explore. Define specific, achievable objectives.
• Select the Case : Choose a case that best suits the research questions. Consider using a typical case for general understanding or an atypical subject for unique insights.
• Data Collection : Use a variety of data sources, such as interviews, observations, documents, and archival records, to provide multiple perspectives on the issue.
• Data Analysis : Identify patterns and themes in the data.
• Report Findings : Present the findings in a structured and clear manner.

Analysts typically use thematic analysis to identify patterns and themes within the data and compare different cases.

• Qualitative Analysis : Such as coding and thematic analysis for narrative data.
• Quantitative Analysis : In cases where numerical data is involved.
• Triangulation : Combining multiple methods or data sources to enhance accuracy.

A good case study requires a balanced approach, often using both qualitative and quantitative methods.

The researcher should constantly reflect on their biases and how they might influence the research. Documenting personal reflections can provide transparency.

Avoid over-generalization. One common mistake is to overstate the implications of a case study. Remember that these studies provide an in-depth insights into a specific case and might not be widely applicable.

Don’t ignore contradictory data. All data, even that which contradicts your hypothesis, is valuable. Ignoring it can lead to skewed results.

Finally, in the report, researchers provide comprehensive insight for a case study through “thick description,” which entails a detailed portrayal of the subject, its usage context, the attributes of involved individuals, and the community environment. Thick description extends to interpreting various data, including demographic details, cultural norms, societal values, prevailing attitudes, and underlying motivations. This approach ensures a nuanced and in-depth comprehension of the case in question.

Learn more about Qualitative Research and Qualitative vs. Quantitative Data .

Morland, J. & Feagin, Joe & Orum, Anthony & Sjoberg, Gideon. (1992). A Case for the Case Study . Social Forces. 71(1):240.

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What Is a Case Study and Why You Should Use Them

Case studies can provide more insights into your business while helping you conduct further research with robust qualitative data analysis to learn more.

If you're in charge of running a company, then you're likely always looking for new ways to run your business more efficiently and increase your customer base while streamlining as many processes as possible.

Unfortunately, it can sometimes be difficult to determine how to go about implementing the proper program in order to be successful. This is why many business owners opt to conduct a case study, which can help significantly. Whether you've been struggling with brand consistency or some other problem, the right case study can identify why your problem exists as well as provide a way to rectify it.

A case study is a great tool that many businesses aren't even aware exists, and there are marketing experts like Mailchimp who can provide you with step-by-step assistance with implementing a plan with a case study. Many companies discover that not only do they need to start a blog in order to improve business, but they also need to create specific and relevant blog titles.

If your company already has a blog, then optimizing your blog posts may be helpful. Regardless of the obstacles that are preventing you from achieving all your professional goals, a case study can work wonders in helping you reverse this issue.

What is a case study?

A case study is a comprehensive report of the results of theory testing or examining emerging themes of a business in real life context. Case studies are also often used in the healthcare industry, conducting health services research with primary research interest around routinely collected healthcare data.

However, for businesses, the purpose of a case study is to help small business owners or company leaders identify the issues and conduct further research into what may be preventing success through information collection, client or customer interviews, and in-depth data analysis.

Knowing the case study definition is crucial for any business owner. By identifying the issues that are hindering a company from achieving all its goals, it's easier to make the necessary corrections to promote success through influenced data collection.

Why are case studies important?

Now that we've answered the questions, "what is a case study?" Why are case studies important? Some of the top reasons why case studies are important include:

• Understand complex issues: Even after you conduct a significant amount of market research , you might have a difficult time understanding exactly what it means. While you might have the basics down, conducting a case study can help you see how that information is applied. Then, when you see how the information can make a difference in business decisions, it could make it easier to understand complex issues.
• Collect data: A case study can also help with data tracking . A case study is a data collection method that can help you describe the information that you have available to you. Then, you can present that information in a way the reader can understand.
• Conduct evaluations: As you learn more about how to write a case study, remember that you can also use a case study to conduct evaluations of a specific situation. A case study is a great way to learn more about complex situations, and you can evaluate how various people responded in that situation. By conducting a case study evaluation, you can learn more about what has worked well, what has not, and what you might want to change in the future.
• Identify potential solutions: A case study can also help you identify solutions to potential problems. If you have an issue in your business that you are trying to solve, you may be able to take a look at a case study where someone has dealt with a similar situation in the past. For example, you may uncover data bias in a specific solution that you would like to address when you tackle the issue on your own. If you need help solving a difficult problem, a case study may be able to help you.

Remember that you can also use case studies to target your audience . If you want to show your audience that you have a significant level of expertise in a field, you may want to publish some case studies that you have handled in the past. Then, when your audience sees that you have had success in a specific area, they may be more likely to provide you with their business. In essence, case studies can be looked at as the original method of social proof, showcasing exactly how you can help someone solve their problems.

What are the benefits of writing a business case study?

Although writing a case study can seem like a tedious task, there are many benefits to conducting one through an in depth qualitative research process.

• Industry understanding: First of all, a case study can give you an in-depth understanding of your industry through a particular conceptual framework and help you identify hidden problems that are preventing you from transcending into the business world.
• Develop theories: If you decide to write a business case study, it provides you with an opportunity to develop new theories. You might have a theory about how to solve a specific problem, but you need to write a business case study to see exactly how that theory has unfolded in the past. Then, you can figure out if you want to apply your theory to a similar issue in the future.
• Evaluate interventions: When you write a business case study that focuses on a specific situation you have been through in the past, you can uncover whether that intervention was truly helpful. This can make it easier to figure out whether you want to use the same intervention in a similar situation in the future.
• Identify best practices: If you want to stay on top of the best practices in your field, conducting case studies can help by allowing you to identify patterns and trends and develop a new list of best practices that you can follow in the future.
• Versatility: Writing a case study also provides you with more versatility. If you want to expand your business applications, you need to figure out how you respond to various problems. When you run a business case study, you open the door to new opportunities, new applications, and new techniques that could help you make a difference in your business down the road.
• Solve problems: Writing a great case study can dramatically improve your chances of reversing your problem and improving your business.
• These are just a few of the biggest benefits you might experience if you decide to publish your case studies. They can be an effective tool for learning, showcasing your talents, and teaching some of your other employees. If you want to grow your audience , you may want to consider publishing some case studies.

What are the limitations of case studies?

Case studies can be a wonderful tool for any business of any size to use to gain an in-depth understanding of their clients, products, customers, or services, but there are limitations.

One limitation of case studies is the fact that, unless there are other recently published examples, there is nothing to compare them to since, most of the time, you are conducting a single, not multiple, case studies.

Another limitation is the fact that most case studies can lack scientific evidence.

Types of case studies

There are specific types of case studies to choose from, and each specific type will yield different results. Some case study types even overlap, which is sometimes more favorable, as they provide even more pertinent data.

Here are overviews of the different types of case studies, each with its own theoretical framework, so you can determine which type would be most effective for helping you meet your goals.

Explanatory case studies

Explanatory case studies are pretty straightforward, as they're not difficult to interpret. This type of case study is best if there aren't many variables involved because explanatory case studies can easily answer questions like "how" and "why" through theory development.

Exploratory case studies

An exploratory case study does exactly what its name implies: it goes into specific detail about the topic at hand in a natural, real-life context with qualitative research.

The benefits of exploratory case studies are limitless, with the main one being that it offers a great deal of flexibility. Having flexibility when writing a case study is important because you can't always predict what obstacles might arise during the qualitative research process.

Collective case studies

Collective case studies require you to study many different individuals in order to obtain usable data.

Case studies that involve an investigation of people will involve many different variables, all of which can't be predicted. Despite this fact, there are many benefits of collective case studies, including the fact that it allows an ongoing analysis of the data collected.

Intrinsic case studies

This type of study differs from the others as it focuses on the inquiry of one specific instance among many possibilities.

Many people prefer these types of case studies because it allows them to learn about the particular instance that they wish to investigate further.

Instrumental case studies

An instrumental case study is similar to an intrinsic one, as it focuses on a particular instance, whether it's a person, organization, or something different.

One thing that differentiates instrumental case studies from intrinsic ones is the fact that instrumental case studies aren't chosen merely because a person is interested in learning about a specific instance.

Tips for writing a case study

If you have decided to write case studies for your company, then you may be unsure of where to start or which type to conduct.

However, it doesn't have to be difficult or confusing to begin conducting a case study that will help you identify ways to improve your business.

Here are some helpful tips for writing your case studies:

1. Your case study must be written in the proper format

When writing a case study, the format that you should be similar to this:

Administrative summary

The executive summary is an overview of what your report will contain, written in a concise manner while providing real-life context.

Despite the fact that the executive summary should appear at the beginning of your case studies, it shouldn't be written until you've completed the entire report because if you write it before you finish the report, this summary may not be completely accurate.

Key problem statement

In this section of your case study, you will briefly describe the problem that you hope to solve by conducting the study. You will have the opportunity to elaborate on the problem that you're focusing on as you get into the breadth of the report.

Problem exploration

This part of the case study isn't as brief as the other two, and it goes into more detail about the problem at hand. Your problem exploration must include why the identified problem needs to be solved as well as the urgency of solving it.

Additionally, it must include justification for conducting the problem-solving, as the benefits must outweigh the efforts and costs.

Proposed resolution

This case study section will also be lengthier than the first two. It must include how you propose going about rectifying the problem. The "recommended solution" section must also include potential obstacles that you might experience, as well as how these will be managed.

Furthermore, you will need to list alternative solutions and explain the reason the chosen solution is best. Charts can enhance your report and make it easier to read, and provide as much proof to substantiate your claim as possible.

Overview of monetary consideration

An overview of monetary consideration is essential for all case studies, as it will be used to convince all involved parties why your project should be funded. You must successfully convince them that the cost is worth the investment it will require. It's important that you stress the necessity for this particular case study and explain the expected outcome.

Execution timeline

In the execution times of case studies, you explain how long you predict it will take to implement your study. The shorter the time it will take to implement your plan, the more apt it is to be approved. However, be sure to provide a reasonable timeline, taking into consideration any additional time that might be needed due to obstacles.

Always include a conclusion in your case study. This is where you will briefly wrap up your entire proposal, stressing the benefits of completing the data collection and data analysis in order to rectify your problem.

2. Make it clear and comprehensive

You want to write your case studies with as much clarity as possible so that every aspect of the report is understood. Be sure to double-check your grammar, spelling, punctuation, and more, as you don't want to submit a poorly-written document.

Not only would a poorly-written case study fail to prove that what you are trying to achieve is important, but it would also increase the chances that your report will be tossed aside and not taken seriously.

3. Don't rush through the process

Writing the perfect case study takes time and patience. Rushing could result in your forgetting to include information that is crucial to your entire study. Don't waste your time creating a study that simply isn't ready. Take the necessary time to perform all the research necessary to write the best case study possible.

Depending on the case study, conducting case study research could mean using qualitative methods, quantitative methods, or both. Qualitative research questions focus on non-numerical data, such as how people feel, their beliefs, their experiences, and so on.

Meanwhile, quantitative research questions focus on numerical or statistical data collection to explain causal links or get an in-depth picture.

It is also important to collect insightful and constructive feedback. This will help you better understand the outcome as well as any changes you need to make to future case studies. Consider using formal and informal ways to collect feedback to ensure that you get a range of opinions and perspectives.

4. Be confident in your theory development

While writing your case study or conducting your formal experimental investigation, you should have confidence in yourself and what you're proposing in your report. If you took the time to gather all the pertinent data collected to complete the report, don't second-guess yourself or doubt your abilities. If you believe your report will be amazing, then it likely will be.

5. Case studies and all qualitative research are long

It's expected that multiple case studies are going to be incredibly boring, and there is no way around this. However, it doesn't mean you can choose your language carefully in order to keep your audience as engaged as possible.

If your audience loses interest in your case study at the beginning, for whatever reason, then this increases the likelihood that your case study will not be funded.

Case study examples

If you want to learn more about how to write a case study, it might be beneficial to take a look at a few case study examples. Below are a few interesting case study examples you may want to take a closer look at.

• Phineas Gage by John Martin Marlow : One of the most famous case studies comes from the medical field, and it is about the story of Phineas Gage, a man who had a railroad spike driven through his head in 1848. As he was working on a railroad, an explosive charge went off prematurely, sending a railroad rod through his head. Even though he survived this incident, he lost his left eye. However, Phineas Gage was studied extensively over the years because his experiences had a significant, lasting impact on his personality. This served as a case study because his injury showed different parts of the brain have different functions.
• Kitty Genovese and the bystander effect : This is a tragic case study that discusses the murder of Kitty Genovese, a woman attacked and murdered in Queens, New York City. Shockingly, while numerous neighbors watched the scene, nobody called for help because they assumed someone else would. This case study helped to define the bystander effect, which is when a person fails to intervene during an emergency because other people are around.
• Henry Molaison and the study of memory : Henry Molaison lost his memory and suffered from debilitating amnesia. He suffered from childhood epilepsy, and medical professionals attempted to remove the part of his brain that was causing his seizures. He had a portion of his brain removed, but it completely took away his ability to hold memories. Even though he went on to live until the age of 82, he was always forced to live in the present moment, as he was completely unable to form new memories.

Case study FAQs

When should you do a case study.

There are several scenarios when conducting a case study can be beneficial. Case studies are often used when there's a "why" or "how" question that needs to be answered. Case studies are also beneficial when trying to understand a complex phenomenon, there's limited research on a topic, or when you're looking for practical solutions to a problem.

How can case study results be used to make business decisions?

You can use the results from a case study to make future business decisions if you find yourself in a similar situation. As you assess the results of a case study, you can identify best practices, evaluate the effectiveness of an intervention, generate new and creative ideas, or get a better understanding of customer needs.

How are case studies different from other research methodologies?

When compared to other research methodologies, such as experimental or qualitative research methodology, a case study does not require a representative sample. For example, if you are performing quantitative research, you have a lot of subjects that expand your sample size. If you are performing experimental research, you may have a random sample in front of you. A case study is usually designed to deliberately focus on unusual situations, which allows it to shed new light on a specific business research problem.

Writing multiple case studies for your business

If you're feeling overwhelmed by the idea of writing a case study and it seems completely foreign, then you aren't alone. Writing a case study for a business is a very big deal, but fortunately, there is help available because an example of a case study doesn't always help.

Mailchimp, a well-known marketing company that provides comprehensive marketing support for all sorts of businesses, can assist you with your case study, or you can review one of their own recently published examples.

Mailchimp can assist you with developing the most effective content strategy to increase your chances of being as successful as possible. Mailchimp's content studio is a great tool that can help your business immensely.

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• Case Study | Definition, Examples & Methods

Case Study | Definition, Examples & Methods

Published on 5 May 2022 by Shona McCombes . Revised on 30 January 2023.

A case study is a detailed study of a specific subject, such as a person, group, place, event, organisation, or phenomenon. Case studies are commonly used in social, educational, clinical, and business research.

A case study research design usually involves qualitative methods , but quantitative methods are sometimes also used. Case studies are good for describing , comparing, evaluating, and understanding different aspects of a research problem .

Table of contents

When to do a case study, step 1: select a case, step 2: build a theoretical framework, step 3: collect your data, step 4: describe and analyse the case.

A case study is an appropriate research design when you want to gain concrete, contextual, in-depth knowledge about a specific real-world subject. It allows you to explore the key characteristics, meanings, and implications of the case.

Case studies are often a good choice in a thesis or dissertation . They keep your project focused and manageable when you don’t have the time or resources to do large-scale research.

You might use just one complex case study where you explore a single subject in depth, or conduct multiple case studies to compare and illuminate different aspects of your research problem.

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Once you have developed your problem statement and research questions , you should be ready to choose the specific case that you want to focus on. A good case study should have the potential to:

• Provide new or unexpected insights into the subject
• Challenge or complicate existing assumptions and theories
• Propose practical courses of action to resolve a problem
• Open up new directions for future research

Unlike quantitative or experimental research, a strong case study does not require a random or representative sample. In fact, case studies often deliberately focus on unusual, neglected, or outlying cases which may shed new light on the research problem.

If you find yourself aiming to simultaneously investigate and solve an issue, consider conducting action research . As its name suggests, action research conducts research and takes action at the same time, and is highly iterative and flexible. 

However, you can also choose a more common or representative case to exemplify a particular category, experience, or phenomenon.

While case studies focus more on concrete details than general theories, they should usually have some connection with theory in the field. This way the case study is not just an isolated description, but is integrated into existing knowledge about the topic. It might aim to:

• Exemplify a theory by showing how it explains the case under investigation
• Expand on a theory by uncovering new concepts and ideas that need to be incorporated
• Challenge a theory by exploring an outlier case that doesn’t fit with established assumptions

To ensure that your analysis of the case has a solid academic grounding, you should conduct a literature review of sources related to the topic and develop a theoretical framework . This means identifying key concepts and theories to guide your analysis and interpretation.

There are many different research methods you can use to collect data on your subject. Case studies tend to focus on qualitative data using methods such as interviews, observations, and analysis of primary and secondary sources (e.g., newspaper articles, photographs, official records). Sometimes a case study will also collect quantitative data .

The aim is to gain as thorough an understanding as possible of the case and its context.

In writing up the case study, you need to bring together all the relevant aspects to give as complete a picture as possible of the subject.

How you report your findings depends on the type of research you are doing. Some case studies are structured like a standard scientific paper or thesis, with separate sections or chapters for the methods , results , and discussion .

Others are written in a more narrative style, aiming to explore the case from various angles and analyse its meanings and implications (for example, by using textual analysis or discourse analysis ).

In all cases, though, make sure to give contextual details about the case, connect it back to the literature and theory, and discuss how it fits into wider patterns or debates.

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McCombes, S. (2023, January 30). Case Study | Definition, Examples & Methods. Scribbr. Retrieved 21 August 2024, from https://www.scribbr.co.uk/research-methods/case-studies/

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What Is a Case Study? Definition, Examples, Types & Methods

What is the definition of a case study.

A case study is typically a research paper to generate an in-depth and multi-faced understanding of any complicated issue in a life scenario. It is a well-written research design that is very commonly used in a wide range of disciplines.

Looking for fast and professional case study assignment help online ? Choose Casestudyhelp.com and enjoy high-quality case study assistance and the lowest rate!

Also Read:  A Complete Guide to Writing an Effective Case Study

Case Study Examples

• Marketing case study examples: Case studies in marketing are written to show your success, and you must always prominently showcase your buoyant suits. You can use bright, bold colours with many contesting fonts, shapes, and simple icons to highlight your case study.
• You need to highlight your big win on the 2nd page with a bright orange colour with highlighted circles.
• Make the essential data stand out exceptionally to track your prospective customers.
• Marketing all the critical data is very important in your marketing case study.

Use a straightforward and crystal clear layout of the case study.

• Using a straightforward layout in any case study is very effective. For example, keeping a spotless white background and drawing slim lines helps to separate these sections in a specific way for formatting the case study.
• Making the information clear helps draw attention to the results and helps to improve the accessibility of the design.
• The case study examples must sit nicely with more extended reports and a consistent layout.

Need Help with Writing a Case Study?

Casestudyhelp.com is the right place that can help you.

What Are the Types of Case Studies?

Case studies can be categorized into several types based on their focus and purpose. Here are some common types of case studies:

• Collective Case Studies : These types of case studies involve investigating any group of individuals. Here, the researchers need to study a group of people in a specific setting or any community. Ex: Psychologists must explore how access to the resources in any society can affect people’s mental wellness.
• Descriptive Case Studies: These involve starting with any descriptive theory. The subjects are then observed, and the gathered information is compared to the preexisting approaches.
• Explanatory Case Studies: These types of case studies are primarily used to conduct any casual investigation. Here, the researchers are more interested in looking for the factors that caused specific results.
• Exploratory Case Studies : These case studies are conducted when researchers want to explore a new or relatively unexplored topic. They are more open-ended and aim to generate hypotheses and ideas for further research.
• Instrumental Case Studies : These case studies are selected because they provide insights into a broader issue or theory. The case is used as a means to investigate a more general phenomenon.
• Intrinsic Case Studies : In these case studies, the case itself is of particular interest due to its uniqueness or rarity. The goal is not to generalize findings to a larger population but to understand the specific case deeply.
• Pilot Case Studies : Pilot case studies are conducted as a preliminary investigation before launching a larger study. They help researchers refine their research questions, methods, and procedures.
• Problem-Oriented Case Studies : These case studies focus on solving a specific problem or addressing a particular issue. Researchers aim to provide practical solutions based on their analysis of the case.
• Ethnographic Case Studies : Ethnographic case studies involve immersing the researcher in the subject’s environment to gain an in-depth cultural understanding. This is often used in anthropology and sociology.
• Longitudinal Case Studies : Longitudinal studies involve observing and analyzing a case over an extended period of time. This allows researchers to track changes, developments, and trends that occur over time.
• Comparative Case Studies : Comparative case studies involve comparing two or more cases to draw similarities, differences, and patterns between them. This type of study is often used to test hypotheses or theories.
• Critical Instance Case Studies : Critical instance cases are chosen because they represent a crucial or pivotal event that can provide insights into a larger issue or theory.

Each type of case study serves a different purpose and is designed to answer specific research questions. Researchers choose the type of case study that best aligns with their objectives and the nature of the phenomenon they are investigating.

Also, Check Out –  Why Is Everyone Talking About Case Study Help?

What Are the Methods of a Case Study?

A   case study research   is a qualitative research design. It is often used in the social sciences since it involves observing the cases or subjects in their settings with the most minor interference from the researcher.

In the case study method, the researchers pose a definite question raging any individual or group for testing their hypotheses or theories. This is done by gathering data from the interviews with the essential data.

Case study research is a perfect way to understand the nuances of any matter often neglected in quantitative research methods. A case study is distinct from any other qualitative study in the following ways:

• Focused on the effect of any set of circumstances in any group or any individual
• It mostly begins with any specific question regarding one or more cases
• It usually focuses on the individual accounts and its experiences

The primary features of case study research methods are as follows:

• The case study methods   must involve the researcher asking a few questions of one person or a small group of people who are known as the respondents for testing the survey.
• The case study in the research mythology might apply triangulation to collect data. It is then analyzed and interpreted to form a hypothesis to be tested through further research or validated by other researchers.
• Concepts are defined using objective language with references to the Preconceived Notions. These individuals may have about them. A researcher sets out to discover by asking any specific question on how people think about their findings.
• The case study method needs a clear concept and theory to guide the processes. A well-organized research question is fundamental while conducting any case study since its results depend on it. The best approach for answering the research questions is challenging the preexisting theories, assumptions or hypotheses.

Benefits and Limitations of Case Studies

The benefits of case studies are as follows:

• Case studies give many details to be collected and will be easily obtained by the other research designs. The collected data is mostly richer than that can be funded via different experimental methods.
• Case studies are primarily conducted on the rare cases where more extensive samples of similar participants are unavailable.
• Within certain case studies, scientific experiments can also be conducted.
• The case studies can also help the experimenters adapt the ideas and produce novel hypotheses for later testing.

Disadvantages of Case Studies

• One of the main criticisms in case studies is that the collected data cannot necessarily be generated for any broader population. This can lead to data being collected over any case study that is only sometimes relevant or useful.
• Some of the case studies still need to be scientific. Many scientists used case studies for conducting several experiments, the results of which were only sometimes very successful.
• Case studies are primarily based on one person, so it can be only one experimenter who is collecting the data. This can lead to a bias in data collection that can influence the results in frequent designs.
• Drawing any definite cause or effect from many case studies is sometimes challenging.

Importance of Case Study

• A case study is a particular research h method involving an up-close and in-depth investigation of any subject, and it is related to a contextual position. These are produced by following a research form. The case study helps in bringing the understanding of any complex issue. This can extend experience or add strength to the already existing knowledge via the previous research. The contextual analysis revolves around a small number of events or situations.
• Researchers have used case studies for an extended period, and they have been successfully applied in various disciplines like social sciences.

Writing the best case study paper on any subject is a challenging task. Thus, you will always need the best service provider in this regard. The  CaseStudyHelp.com   is the top choice for you.

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• Introduction

The case study creation process

Types of case studies, benefits and limitations.

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• Table Of Contents

case study , detailed description and assessment of a specific situation in the real world created for the purpose of deriving generalizations and other insights from it. A case study can be about an individual, a group of people, an organization, or an event, among other subjects.

By focusing on a specific subject in its natural setting, a case study can help improve understanding of the broader features and processes at work. Case studies are a research method used in multiple fields, including business, criminology , education , medicine and other forms of health care, anthropology , political science , psychology , and social work . Data in case studies can be both qualitative and quantitative. Unlike experiments, where researchers control and manipulate situations, case studies are considered to be “naturalistic” because subjects are studied in their natural context . ( See also natural experiment .)

The creation of a case study typically involves the following steps:

• The research question to be studied is defined, informed by existing literature and previous research. Researchers should clearly define the scope of the case, and they should compile a list of evidence to be collected as well as identify the nature of insights that they expect to gain from the case study.
• Once the case is identified, the research team is given access to the individual, organization, or situation being studied. Individuals are informed of risks associated with participation and must provide their consent , which may involve signing confidentiality or anonymity agreements.
• Researchers then collect evidence using multiple methods, which may include qualitative techniques, such as interviews, focus groups , and direct observations, as well as quantitative methods, such as surveys, questionnaires, and data audits. The collection procedures need to be well defined to ensure the relevance and accuracy of the evidence.
• The collected evidence is analyzed to come up with insights. Each data source must be reviewed carefully by itself and in the larger context of the case study so as to ensure continued relevance. At the same time, care must be taken not to force the analysis to fit (potentially preconceived) conclusions. While the eventual case study may serve as the basis for generalizations, these generalizations must be made cautiously to ensure that specific nuances are not lost in the averages.
• Finally, the case study is packaged for larger groups and publication. At this stage some information may be withheld, as in business case studies, to allow readers to draw their own conclusions. In scientific fields, the completed case study needs to be a coherent whole, with all findings and statistical relationships clearly documented.

Case studies have been used as a research method across multiple fields. They are particularly popular in the fields of law, business, and employee training; they typically focus on a problem that an individual or organization is facing. The situation is presented in considerable detail, often with supporting data, to discussion participants, who are asked to make recommendations that will solve the stated problem. The business case study as a method of instruction was made popular in the 1920s by instructors at Harvard Business School who adapted an approach used at Harvard Law School in which real-world cases were used in classroom discussions. Other business and law schools started compiling case studies as teaching aids for students. In a business school case study, students are not provided with the complete list of facts pertaining to the topic and are thus forced to discuss and compare their perspectives with those of their peers to recommend solutions.

In criminology , case studies typically focus on the lives of an individual or a group of individuals. These studies can provide particularly valuable insight into the personalities and motives of individual criminals, but they may suffer from a lack of objectivity on the part of the researchers (typically because of the researchers’ biases when working with people with a criminal history), and their findings may be difficult to generalize.

In sociology , the case-study method was developed by Frédéric Le Play in France during the 19th century. This approach involves a field worker staying with a family for a period of time, gathering data on the family members’ attitudes and interactions and on their income, expenditures, and physical possessions. Similar approaches have been used in anthropology . Such studies can sometimes continue for many years.

Case studies provide insight into situations that involve a specific entity or set of circumstances. They can be beneficial in helping to explain the causal relationships between quantitative indicators in a field of study, such as what drives a company’s market share. By introducing real-world examples, they also plunge the reader into an actual, concrete situation and make the concepts real rather than theoretical. They also help people study rare situations that they might not otherwise experience.

Because case studies are in a “naturalistic” environment , they are limited in terms of research design: researchers lack control over what they are studying, which means that the results often cannot be reproduced. Also, care must be taken to stay within the bounds of the research question on which the case study is focusing. Other limitations to case studies revolve around the data collected. It may be difficult, for instance, for researchers to organize the large volume of data that can emerge from the study, and their analysis of the data must be carefully thought through to produce scientifically valid insights. The research methodology used to generate these insights is as important as the insights themselves, for the latter need to be seen in the proper context. Taken out of context, they may lead to erroneous conclusions. Like all scientific studies, case studies need to be approached objectively; personal bias or opinion may skew the research methods as well as the results. ( See also confirmation bias .)

Business case studies in particular have been criticized for approaching a problem or situation from a narrow perspective. Students are expected to come up with solutions for a problem based on the data provided. However, in real life, the situation is typically reversed: business managers face a problem and must then look for data to help them solve it.

What is case study research?

Last updated

8 February 2023

Reviewed by

Cathy Heath

Short on time? Get an AI generated summary of this article instead

Suppose a company receives a spike in the number of customer complaints, or medical experts discover an outbreak of illness affecting children but are not quite sure of the reason. In both cases, carrying out a case study could be the best way to get answers.

Organization

Case studies can be carried out across different disciplines, including education, medicine, sociology, and business.

Most case studies employ qualitative methods, but quantitative methods can also be used. Researchers can then describe, compare, evaluate, and identify patterns or cause-and-effect relationships between the various variables under study. They can then use this knowledge to decide what action to take. 

Another thing to note is that case studies are generally singular in their focus. This means they narrow focus to a particular area, making them highly subjective. You cannot always generalize the results of a case study and apply them to a larger population. However, they are valuable tools to illustrate a principle or develop a thesis.

Analyze case study research

Dovetail streamlines case study research to help you uncover and share actionable insights

• What are the different types of case study designs?

Researchers can choose from a variety of case study designs. The design they choose is dependent on what questions they need to answer, the context of the research environment, how much data they already have, and what resources are available.

Here are the common types of case study design:

Explanatory

An explanatory case study is an initial explanation of the how or why that is behind something. This design is commonly used when studying a real-life phenomenon or event. Once the organization understands the reasons behind a phenomenon, it can then make changes to enhance or eliminate the variables causing it. 

Here is an example: How is co-teaching implemented in elementary schools? The title for a case study of this subject could be “Case Study of the Implementation of Co-Teaching in Elementary Schools.”

Descriptive

An illustrative or descriptive case study helps researchers shed light on an unfamiliar object or subject after a period of time. The case study provides an in-depth review of the issue at hand and adds real-world examples in the area the researcher wants the audience to understand. 

The researcher makes no inferences or causal statements about the object or subject under review. This type of design is often used to understand cultural shifts.

Here is an example: How did people cope with the 2004 Indian Ocean Tsunami? This case study could be titled "A Case Study of the 2004 Indian Ocean Tsunami and its Effect on the Indonesian Population."

Exploratory

Exploratory research is also called a pilot case study. It is usually the first step within a larger research project, often relying on questionnaires and surveys . Researchers use exploratory research to help narrow down their focus, define parameters, draft a specific research question , and/or identify variables in a larger study. This research design usually covers a wider area than others, and focuses on the ‘what’ and ‘who’ of a topic.

Here is an example: How do nutrition and socialization in early childhood affect learning in children? The title of the exploratory study may be “Case Study of the Effects of Nutrition and Socialization on Learning in Early Childhood.”

An intrinsic case study is specifically designed to look at a unique and special phenomenon. At the start of the study, the researcher defines the phenomenon and the uniqueness that differentiates it from others. 

In this case, researchers do not attempt to generalize, compare, or challenge the existing assumptions. Instead, they explore the unique variables to enhance understanding. Here is an example: “Case Study of Volcanic Lightning.”

This design can also be identified as a cumulative case study. It uses information from past studies or observations of groups of people in certain settings as the foundation of the new study. Given that it takes multiple areas into account, it allows for greater generalization than a single case study. 

The researchers also get an in-depth look at a particular subject from different viewpoints.  Here is an example: “Case Study of how PTSD affected Vietnam and Gulf War Veterans Differently Due to Advances in Military Technology.”

Critical instance

A critical case study incorporates both explanatory and intrinsic study designs. It does not have predetermined purposes beyond an investigation of the said subject. It can be used for a deeper explanation of the cause-and-effect relationship. It can also be used to question a common assumption or myth. 

The findings can then be used further to generalize whether they would also apply in a different environment.  Here is an example: “What Effect Does Prolonged Use of Social Media Have on the Mind of American Youth?”

Instrumental

Instrumental research attempts to achieve goals beyond understanding the object at hand. Researchers explore a larger subject through different, separate studies and use the findings to understand its relationship to another subject. This type of design also provides insight into an issue or helps refine a theory. 

For example, you may want to determine if violent behavior in children predisposes them to crime later in life. The focus is on the relationship between children and violent behavior, and why certain children do become violent. Here is an example: “Violence Breeds Violence: Childhood Exposure and Participation in Adult Crime.”

Evaluation case study design is employed to research the effects of a program, policy, or intervention, and assess its effectiveness and impact on future decision-making. 

For example, you might want to see whether children learn times tables quicker through an educational game on their iPad versus a more teacher-led intervention. Here is an example: “An Investigation of the Impact of an iPad Multiplication Game for Primary School Children.” 

• When do you use case studies?

Case studies are ideal when you want to gain a contextual, concrete, or in-depth understanding of a particular subject. It helps you understand the characteristics, implications, and meanings of the subject.

They are also an excellent choice for those writing a thesis or dissertation, as they help keep the project focused on a particular area when resources or time may be too limited to cover a wider one. You may have to conduct several case studies to explore different aspects of the subject in question and understand the problem.

• What are the steps to follow when conducting a case study?

1. Select a case

Once you identify the problem at hand and come up with questions, identify the case you will focus on. The study can provide insights into the subject at hand, challenge existing assumptions, propose a course of action, and/or open up new areas for further research.

2. Create a theoretical framework

While you will be focusing on a specific detail, the case study design you choose should be linked to existing knowledge on the topic. This prevents it from becoming an isolated description and allows for enhancing the existing information. 

It may expand the current theory by bringing up new ideas or concepts, challenge established assumptions, or exemplify a theory by exploring how it answers the problem at hand. A theoretical framework starts with a literature review of the sources relevant to the topic in focus. This helps in identifying key concepts to guide analysis and interpretation.

3. Collect the data

Case studies are frequently supplemented with qualitative data such as observations, interviews, and a review of both primary and secondary sources such as official records, news articles, and photographs. There may also be quantitative data —this data assists in understanding the case thoroughly.

4. Analyze your case

The results of the research depend on the research design. Most case studies are structured with chapters or topic headings for easy explanation and presentation. Others may be written as narratives to allow researchers to explore various angles of the topic and analyze its meanings and implications.

In all areas, always give a detailed contextual understanding of the case and connect it to the existing theory and literature before discussing how it fits into your problem area.

• What are some case study examples?

What are the best approaches for introducing our product into the Kenyan market?

How does the change in marketing strategy aid in increasing the sales volumes of product Y?

How can teachers enhance student participation in classrooms?

How does poverty affect literacy levels in children?

Case study topics

Case study of product marketing strategies in the Kenyan market

Case study of the effects of a marketing strategy change on product Y sales volumes

Case study of X school teachers that encourage active student participation in the classroom

Case study of the effects of poverty on literacy levels in children

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Blog Beginner Guides 6 Types of Case Studies to Inspire Your Research and Analysis

6 Types of Case Studies to Inspire Your Research and Analysis

Written by: Ronita Mohan Sep 20, 2021

Case studies have become powerful business tools. But what is a case study? What are the benefits of creating one? Are there limitations to the format?

If you’ve asked yourself these questions, our helpful guide will clear things up. Learn how to use a case study for business. Find out how cases analysis works in psychology and research.

We’ve also got examples of case studies to inspire you.

Haven’t made a case study before? You can easily  create a case study  with Venngage’s customizable case study templates .

Click to jump ahead:

What is a case study?

6 types of case studies, what is a business case study, what is a case study in research, what is a case study in psychology, what is the case study method, benefits of case studies, limitations of case studies, faqs about case studies.

A case study is a research process aimed at learning about a subject, an event or an organization. Case studies are use in business, the social sciences and healthcare.

A case study may focus on one observation or many. It can also examine a series of events or a single case. An effective case study tells a story and provides a conclusion.

Healthcare industries write reports on patients and diagnoses. Marketing case study examples , like the one below, highlight the benefits of a business product.

Now that you know what a case study is, let’s look at the six different types of case studies next.

There are six common types of case reports. Depending on your industry, you might use one of these types.

Descriptive case studies

Explanatory case studies, exploratory case reports, intrinsic case studies, instrumental case studies, collective case reports.

We go into more detail about each type of study in the guide below.

Related:  15+ Professional Case Study Examples [Design Tips + Templates]

When you have an existing hypothesis, you can design a descriptive study. This type of report starts with a description. The aim is to find connections between the subject being studied and a theory.

Once these connections are found, the study can conclude. The results of this type of study will usually suggest how to develop a theory further.

A study like the one below has concrete results. A descriptive report would use the quantitative data as a suggestion for researching the subject deeply.

When an incident occurs in a field, an explanation is required. An explanatory report investigates the cause of the event. It will include explanations for that cause.

The study will also share details about the impact of the event. In most cases, this report will use evidence to predict future occurrences. The results of explanatory reports are definitive.

Note that there is no room for interpretation here. The results are absolute.

The study below is a good example. It explains how one brand used the services of another. It concludes by showing definitive proof that the collaboration was successful.

Another example of this study would be in the automotive industry. If a vehicle fails a test, an explanatory study will examine why. The results could show that the failure was because of a particular part.

Related: How to Write a Case Study [+ Design Tips]

An explanatory report is a self-contained document. An exploratory one is only the beginning of an investigation.

Exploratory cases act as the starting point of studies. This is usually conducted as a precursor to large-scale investigations. The research is used to suggest why further investigations are needed.

An exploratory study can also be used to suggest methods for further examination.

For example, the below analysis could have found inconclusive results. In that situation, it would be the basis for an in-depth study.

Intrinsic studies are more common in the field of psychology. These reports can also be conducted in healthcare or social work.

These types of studies focus on a unique subject, such as a patient. They can sometimes study groups close to the researcher.

The aim of such studies is to understand the subject better. This requires learning their history. The researcher will also examine how they interact with their environment.

For instance, if the case study below was about a unique brand, it could be an intrinsic study.

Once the study is complete, the researcher will have developed a better understanding of a phenomenon. This phenomenon will likely not have been studied or theorized about before.

Examples of intrinsic case analysis can be found across psychology. For example, Jean Piaget’s theories on cognitive development. He established the theory from intrinsic studies into his own children.

Related: What Disney Villains Can Tell Us About Color Psychology [Infographic]

This is another type of study seen in medical and psychology fields. Instrumental reports are created to examine more than just the primary subject.

When research is conducted for an instrumental study, it is to provide the basis for a larger phenomenon. The subject matter is usually the best example of the phenomenon. This is why it is being studied.

Take the example of the fictional brand below.

Assume it’s examining lead generation strategies. It may want to show that visual marketing is the definitive lead generation tool. The brand can conduct an instrumental case study to examine this phenomenon.

Collective studies are based on instrumental case reports. These types of studies examine multiple reports.

There are a number of reasons why collective reports are created:

• To provide evidence for starting a new study
• To find pattens between multiple instrumental reports
• To find differences in similar types of cases
• Gain a deeper understanding of a complex phenomenon
• Understand a phenomenon from diverse contexts

A researcher could use multiple reports, like the one below, to build a collective case report.

Related: 10+ Case Study Infographic Templates That Convert

A business or marketing case study aims at showcasing a successful partnership. This can be between a brand and a client. Or the case study can examine a brand’s project.

There is a perception that case studies are used to advertise a brand. But effective reports, like the one below, can show clients how a brand can support them.

Hubspot created a case study on a customer that successfully scaled its business. The report outlines the various Hubspot tools used to achieve these results.

Hubspot also added a video with testimonials from the client company’s employees.

So, what is the purpose of a case study for businesses? There is a lot of competition in the corporate world. Companies are run by people. They can be on the fence about which brand to work with.

Business reports  stand out aesthetically, as well. They use  brand colors  and brand fonts . Usually, a combination of the client’s and the brand’s.

With the Venngage  My Brand Kit  feature, businesses can automatically apply their brand to designs.

A business case study, like the one below, acts as social proof. This helps customers decide between your brand and your competitors.

Don’t know how to design a report? You can learn  how to write a case study  with Venngage’s guide. We also share design tips and examples that will help you convert.

Related: 55+ Annual Report Design Templates, Inspirational Examples & Tips [Updated]

Research is a necessary part of every case study. But specific research fields are required to create studies. These fields include user research, healthcare, education, or social work.

For example, this UX Design  report examined the public perception of a client. The brand researched and implemented new visuals to improve it. The study breaks down this research through lessons learned.

Clinical reports are a necessity in the medical field. These documents are used to share knowledge with other professionals. They also help examine new or unusual diseases or symptoms.

The pandemic has led to a significant increase in research. For example,  Spectrum Health  studied the value of health systems in the pandemic. They created the study by examining community outreach.

The pandemic has significantly impacted the field of education. This has led to numerous examinations on remote studying. There have also been studies on how students react to decreased peer communication.

Social work case reports often have a community focus. They can also examine public health responses. In certain regions, social workers study disaster responses.

You now know what case studies in various fields are. In the next step of our guide, we explain the case study method.

In the field of psychology, case studies focus on a particular subject. Psychology case histories also examine human behaviors.

Case reports search for commonalities between humans. They are also used to prescribe further research. Or these studies can elaborate on a solution for a behavioral ailment.

The American Psychology Association  has a number of case studies on real-life clients. Note how the reports are more text-heavy than a business case study.

Famous psychologists such as Sigmund Freud and Anna O popularised the use of case studies in the field. They did so by regularly interviewing subjects. Their detailed observations build the field of psychology.

It is important to note that psychological studies must be conducted by professionals. Psychologists, psychiatrists and therapists should be the researchers in these cases.

Related: What Netflix’s Top 50 Shows Can Teach Us About Font Psychology [Infographic]

The case study method, or case method, is a learning technique where you’re presented with a real-world business challenge and asked how you’d solve it.

After working through it independently and with peers, you learn how the actual scenario unfolded. This approach helps develop problem-solving skills and practical knowledge.

This method often uses various data sources like interviews, observations, and documents to provide comprehensive insights. The below example would have been created after numerous interviews.

Case studies are largely qualitative. They analyze and describe phenomena. While some data is included, a case analysis is not quantitative.

There are a few steps in the case method. You have to start by identifying the subject of your study. Then determine what kind of research is required.

In natural sciences, case studies can take years to complete. Business reports, like this one, don’t take that long. A few weeks of interviews should be enough.

The case method will vary depending on the industry. Reports will also look different once produced.

As you will have seen, business reports are more colorful. The design is also more accessible . Healthcare and psychology reports are more text-heavy.

Designing case reports takes time and energy. So, is it worth taking the time to write them? Here are the benefits of creating case studies.

• Collects large amounts of information
• Helps formulate hypotheses
• Builds the case for further research
• Discovers new insights into a subject
• Builds brand trust and loyalty
• Engages customers through stories

For example, the business study below creates a story around a brand partnership. It makes for engaging reading. The study also shows evidence backing up the information.

We’ve shared the benefits of why studies are needed. We will also look at the limitations of creating them.

Related: How to Present a Case Study like a Pro (With Examples)

There are a few disadvantages to conducting a case analysis. The limitations will vary according to the industry.

• Responses from interviews are subjective
• Subjects may tailor responses to the researcher
• Studies can’t always be replicated
• In certain industries, analyses can take time and be expensive
• Risk of generalizing the results among a larger population

These are some of the common weaknesses of creating case reports. If you’re on the fence, look at the competition in your industry.

Other brands or professionals are building reports, like this example. In that case, you may want to do the same.

What makes a case study a case study?

A case study has a very particular research methodology. They are an in-depth study of a person or a group of individuals. They can also study a community or an organization. Case reports examine real-world phenomena within a set context.

How long should a case study be?

The length of studies depends on the industry. It also depends on the story you’re telling. Most case studies should be at least 500-1500 words long. But you can increase the length if you have more details to share.

What should you ask in a case study?

The one thing you shouldn’t ask is ‘yes’ or ‘no’ questions. Case studies are qualitative. These questions won’t give you the information you need.

Ask your client about the problems they faced. Ask them about solutions they found. Or what they think is the ideal solution. Leave room to ask them follow-up questions. This will help build out the study.

How to present a case study?

When you’re ready to present a case study, begin by providing a summary of the problem or challenge you were addressing. Follow this with an outline of the solution you implemented, and support this with the results you achieved, backed by relevant data. Incorporate visual aids like slides, graphs, and images to make your case study presentation more engaging and impactful.

Now you know what a case study means, you can begin creating one. These reports are a great tool for analyzing brands. They are also useful in a variety of other fields.

Use a visual communication platform like Venngage to design case studies. With Venngage’s templates, you can design easily. Create branded, engaging reports, all without design experience.

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Organizing Your Social Sciences Research Assignments

• Annotated Bibliography
• Analyzing a Scholarly Journal Article
• Group Presentations
• Dealing with Nervousness
• Using Visual Aids
• Grading Someone Else's Paper
• Types of Structured Group Activities
• Group Project Survival Skills
• Leading a Class Discussion
• Multiple Book Review Essay
• Reviewing Collected Works
• Writing a Case Analysis Paper
• Writing a Case Study
• About Informed Consent
• Writing Field Notes
• Writing a Policy Memo
• Writing a Reflective Paper
• Writing a Research Proposal
• Generative AI and Writing
• Acknowledgments

A case study research paper examines a person, place, event, condition, phenomenon, or other type of subject of analysis in order to extrapolate  key themes and results that help predict future trends, illuminate previously hidden issues that can be applied to practice, and/or provide a means for understanding an important research problem with greater clarity. A case study research paper usually examines a single subject of analysis, but case study papers can also be designed as a comparative investigation that shows relationships between two or more subjects. The methods used to study a case can rest within a quantitative, qualitative, or mixed-method investigative paradigm.

Case Studies. Writing@CSU. Colorado State University; Mills, Albert J. , Gabrielle Durepos, and Eiden Wiebe, editors. Encyclopedia of Case Study Research . Thousand Oaks, CA: SAGE Publications, 2010 ; “What is a Case Study?” In Swanborn, Peter G. Case Study Research: What, Why and How? London: SAGE, 2010.

How to Approach Writing a Case Study Research Paper

General information about how to choose a topic to investigate can be found under the " Choosing a Research Problem " tab in the Organizing Your Social Sciences Research Paper writing guide. Review this page because it may help you identify a subject of analysis that can be investigated using a case study design.

However, identifying a case to investigate involves more than choosing the research problem . A case study encompasses a problem contextualized around the application of in-depth analysis, interpretation, and discussion, often resulting in specific recommendations for action or for improving existing conditions. As Seawright and Gerring note, practical considerations such as time and access to information can influence case selection, but these issues should not be the sole factors used in describing the methodological justification for identifying a particular case to study. Given this, selecting a case includes considering the following:

• The case represents an unusual or atypical example of a research problem that requires more in-depth analysis? Cases often represent a topic that rests on the fringes of prior investigations because the case may provide new ways of understanding the research problem. For example, if the research problem is to identify strategies to improve policies that support girl's access to secondary education in predominantly Muslim nations, you could consider using Azerbaijan as a case study rather than selecting a more obvious nation in the Middle East. Doing so may reveal important new insights into recommending how governments in other predominantly Muslim nations can formulate policies that support improved access to education for girls.
• The case provides important insight or illuminate a previously hidden problem? In-depth analysis of a case can be based on the hypothesis that the case study will reveal trends or issues that have not been exposed in prior research or will reveal new and important implications for practice. For example, anecdotal evidence may suggest drug use among homeless veterans is related to their patterns of travel throughout the day. Assuming prior studies have not looked at individual travel choices as a way to study access to illicit drug use, a case study that observes a homeless veteran could reveal how issues of personal mobility choices facilitate regular access to illicit drugs. Note that it is important to conduct a thorough literature review to ensure that your assumption about the need to reveal new insights or previously hidden problems is valid and evidence-based.
• The case challenges and offers a counter-point to prevailing assumptions? Over time, research on any given topic can fall into a trap of developing assumptions based on outdated studies that are still applied to new or changing conditions or the idea that something should simply be accepted as "common sense," even though the issue has not been thoroughly tested in current practice. A case study analysis may offer an opportunity to gather evidence that challenges prevailing assumptions about a research problem and provide a new set of recommendations applied to practice that have not been tested previously. For example, perhaps there has been a long practice among scholars to apply a particular theory in explaining the relationship between two subjects of analysis. Your case could challenge this assumption by applying an innovative theoretical framework [perhaps borrowed from another discipline] to explore whether this approach offers new ways of understanding the research problem. Taking a contrarian stance is one of the most important ways that new knowledge and understanding develops from existing literature.
• The case provides an opportunity to pursue action leading to the resolution of a problem? Another way to think about choosing a case to study is to consider how the results from investigating a particular case may result in findings that reveal ways in which to resolve an existing or emerging problem. For example, studying the case of an unforeseen incident, such as a fatal accident at a railroad crossing, can reveal hidden issues that could be applied to preventative measures that contribute to reducing the chance of accidents in the future. In this example, a case study investigating the accident could lead to a better understanding of where to strategically locate additional signals at other railroad crossings so as to better warn drivers of an approaching train, particularly when visibility is hindered by heavy rain, fog, or at night.
• The case offers a new direction in future research? A case study can be used as a tool for an exploratory investigation that highlights the need for further research about the problem. A case can be used when there are few studies that help predict an outcome or that establish a clear understanding about how best to proceed in addressing a problem. For example, after conducting a thorough literature review [very important!], you discover that little research exists showing the ways in which women contribute to promoting water conservation in rural communities of east central Africa. A case study of how women contribute to saving water in a rural village of Uganda can lay the foundation for understanding the need for more thorough research that documents how women in their roles as cooks and family caregivers think about water as a valuable resource within their community. This example of a case study could also point to the need for scholars to build new theoretical frameworks around the topic [e.g., applying feminist theories of work and family to the issue of water conservation].

Eisenhardt, Kathleen M. “Building Theories from Case Study Research.” Academy of Management Review 14 (October 1989): 532-550; Emmel, Nick. Sampling and Choosing Cases in Qualitative Research: A Realist Approach . Thousand Oaks, CA: SAGE Publications, 2013; Gerring, John. “What Is a Case Study and What Is It Good for?” American Political Science Review 98 (May 2004): 341-354; Mills, Albert J. , Gabrielle Durepos, and Eiden Wiebe, editors. Encyclopedia of Case Study Research . Thousand Oaks, CA: SAGE Publications, 2010; Seawright, Jason and John Gerring. "Case Selection Techniques in Case Study Research." Political Research Quarterly 61 (June 2008): 294-308.

Structure and Writing Style

The purpose of a paper in the social sciences designed around a case study is to thoroughly investigate a subject of analysis in order to reveal a new understanding about the research problem and, in so doing, contributing new knowledge to what is already known from previous studies. In applied social sciences disciplines [e.g., education, social work, public administration, etc.], case studies may also be used to reveal best practices, highlight key programs, or investigate interesting aspects of professional work.

In general, the structure of a case study research paper is not all that different from a standard college-level research paper. However, there are subtle differences you should be aware of. Here are the key elements to organizing and writing a case study research paper.

I.  Introduction

As with any research paper, your introduction should serve as a roadmap for your readers to ascertain the scope and purpose of your study . The introduction to a case study research paper, however, should not only describe the research problem and its significance, but you should also succinctly describe why the case is being used and how it relates to addressing the problem. The two elements should be linked. With this in mind, a good introduction answers these four questions:

• What is being studied? Describe the research problem and describe the subject of analysis [the case] you have chosen to address the problem. Explain how they are linked and what elements of the case will help to expand knowledge and understanding about the problem.
• Why is this topic important to investigate? Describe the significance of the research problem and state why a case study design and the subject of analysis that the paper is designed around is appropriate in addressing the problem.
• What did we know about this topic before I did this study? Provide background that helps lead the reader into the more in-depth literature review to follow. If applicable, summarize prior case study research applied to the research problem and why it fails to adequately address the problem. Describe why your case will be useful. If no prior case studies have been used to address the research problem, explain why you have selected this subject of analysis.
• How will this study advance new knowledge or new ways of understanding? Explain why your case study will be suitable in helping to expand knowledge and understanding about the research problem.

Each of these questions should be addressed in no more than a few paragraphs. Exceptions to this can be when you are addressing a complex research problem or subject of analysis that requires more in-depth background information.

II.  Literature Review

The literature review for a case study research paper is generally structured the same as it is for any college-level research paper. The difference, however, is that the literature review is focused on providing background information and  enabling historical interpretation of the subject of analysis in relation to the research problem the case is intended to address . This includes synthesizing studies that help to:

• Place relevant works in the context of their contribution to understanding the case study being investigated . This would involve summarizing studies that have used a similar subject of analysis to investigate the research problem. If there is literature using the same or a very similar case to study, you need to explain why duplicating past research is important [e.g., conditions have changed; prior studies were conducted long ago, etc.].
• Describe the relationship each work has to the others under consideration that informs the reader why this case is applicable . Your literature review should include a description of any works that support using the case to investigate the research problem and the underlying research questions.
• Identify new ways to interpret prior research using the case study . If applicable, review any research that has examined the research problem using a different research design. Explain how your use of a case study design may reveal new knowledge or a new perspective or that can redirect research in an important new direction.
• Resolve conflicts amongst seemingly contradictory previous studies . This refers to synthesizing any literature that points to unresolved issues of concern about the research problem and describing how the subject of analysis that forms the case study can help resolve these existing contradictions.
• Point the way in fulfilling a need for additional research . Your review should examine any literature that lays a foundation for understanding why your case study design and the subject of analysis around which you have designed your study may reveal a new way of approaching the research problem or offer a perspective that points to the need for additional research.
• Expose any gaps that exist in the literature that the case study could help to fill . Summarize any literature that not only shows how your subject of analysis contributes to understanding the research problem, but how your case contributes to a new way of understanding the problem that prior research has failed to do.
• Locate your own research within the context of existing literature [very important!] . Collectively, your literature review should always place your case study within the larger domain of prior research about the problem. The overarching purpose of reviewing pertinent literature in a case study paper is to demonstrate that you have thoroughly identified and synthesized prior studies in relation to explaining the relevance of the case in addressing the research problem.

III.  Method

In this section, you explain why you selected a particular case [i.e., subject of analysis] and the strategy you used to identify and ultimately decide that your case was appropriate in addressing the research problem. The way you describe the methods used varies depending on the type of subject of analysis that constitutes your case study.

If your subject of analysis is an incident or event . In the social and behavioral sciences, the event or incident that represents the case to be studied is usually bounded by time and place, with a clear beginning and end and with an identifiable location or position relative to its surroundings. The subject of analysis can be a rare or critical event or it can focus on a typical or regular event. The purpose of studying a rare event is to illuminate new ways of thinking about the broader research problem or to test a hypothesis. Critical incident case studies must describe the method by which you identified the event and explain the process by which you determined the validity of this case to inform broader perspectives about the research problem or to reveal new findings. However, the event does not have to be a rare or uniquely significant to support new thinking about the research problem or to challenge an existing hypothesis. For example, Walo, Bull, and Breen conducted a case study to identify and evaluate the direct and indirect economic benefits and costs of a local sports event in the City of Lismore, New South Wales, Australia. The purpose of their study was to provide new insights from measuring the impact of a typical local sports event that prior studies could not measure well because they focused on large "mega-events." Whether the event is rare or not, the methods section should include an explanation of the following characteristics of the event: a) when did it take place; b) what were the underlying circumstances leading to the event; and, c) what were the consequences of the event in relation to the research problem.

If your subject of analysis is a person. Explain why you selected this particular individual to be studied and describe what experiences they have had that provide an opportunity to advance new understandings about the research problem. Mention any background about this person which might help the reader understand the significance of their experiences that make them worthy of study. This includes describing the relationships this person has had with other people, institutions, and/or events that support using them as the subject for a case study research paper. It is particularly important to differentiate the person as the subject of analysis from others and to succinctly explain how the person relates to examining the research problem [e.g., why is one politician in a particular local election used to show an increase in voter turnout from any other candidate running in the election]. Note that these issues apply to a specific group of people used as a case study unit of analysis [e.g., a classroom of students].

If your subject of analysis is a place. In general, a case study that investigates a place suggests a subject of analysis that is unique or special in some way and that this uniqueness can be used to build new understanding or knowledge about the research problem. A case study of a place must not only describe its various attributes relevant to the research problem [e.g., physical, social, historical, cultural, economic, political], but you must state the method by which you determined that this place will illuminate new understandings about the research problem. It is also important to articulate why a particular place as the case for study is being used if similar places also exist [i.e., if you are studying patterns of homeless encampments of veterans in open spaces, explain why you are studying Echo Park in Los Angeles rather than Griffith Park?]. If applicable, describe what type of human activity involving this place makes it a good choice to study [e.g., prior research suggests Echo Park has more homeless veterans].

If your subject of analysis is a phenomenon. A phenomenon refers to a fact, occurrence, or circumstance that can be studied or observed but with the cause or explanation to be in question. In this sense, a phenomenon that forms your subject of analysis can encompass anything that can be observed or presumed to exist but is not fully understood. In the social and behavioral sciences, the case usually focuses on human interaction within a complex physical, social, economic, cultural, or political system. For example, the phenomenon could be the observation that many vehicles used by ISIS fighters are small trucks with English language advertisements on them. The research problem could be that ISIS fighters are difficult to combat because they are highly mobile. The research questions could be how and by what means are these vehicles used by ISIS being supplied to the militants and how might supply lines to these vehicles be cut off? How might knowing the suppliers of these trucks reveal larger networks of collaborators and financial support? A case study of a phenomenon most often encompasses an in-depth analysis of a cause and effect that is grounded in an interactive relationship between people and their environment in some way.

NOTE:   The choice of the case or set of cases to study cannot appear random. Evidence that supports the method by which you identified and chose your subject of analysis should clearly support investigation of the research problem and linked to key findings from your literature review. Be sure to cite any studies that helped you determine that the case you chose was appropriate for examining the problem.

IV.  Discussion

The main elements of your discussion section are generally the same as any research paper, but centered around interpreting and drawing conclusions about the key findings from your analysis of the case study. Note that a general social sciences research paper may contain a separate section to report findings. However, in a paper designed around a case study, it is common to combine a description of the results with the discussion about their implications. The objectives of your discussion section should include the following:

Reiterate the Research Problem/State the Major Findings Briefly reiterate the research problem you are investigating and explain why the subject of analysis around which you designed the case study were used. You should then describe the findings revealed from your study of the case using direct, declarative, and succinct proclamation of the study results. Highlight any findings that were unexpected or especially profound.

Explain the Meaning of the Findings and Why They are Important Systematically explain the meaning of your case study findings and why you believe they are important. Begin this part of the section by repeating what you consider to be your most important or surprising finding first, then systematically review each finding. Be sure to thoroughly extrapolate what your analysis of the case can tell the reader about situations or conditions beyond the actual case that was studied while, at the same time, being careful not to misconstrue or conflate a finding that undermines the external validity of your conclusions.

Relate the Findings to Similar Studies No study in the social sciences is so novel or possesses such a restricted focus that it has absolutely no relation to previously published research. The discussion section should relate your case study results to those found in other studies, particularly if questions raised from prior studies served as the motivation for choosing your subject of analysis. This is important because comparing and contrasting the findings of other studies helps support the overall importance of your results and it highlights how and in what ways your case study design and the subject of analysis differs from prior research about the topic.

Consider Alternative Explanations of the Findings Remember that the purpose of social science research is to discover and not to prove. When writing the discussion section, you should carefully consider all possible explanations revealed by the case study results, rather than just those that fit your hypothesis or prior assumptions and biases. Be alert to what the in-depth analysis of the case may reveal about the research problem, including offering a contrarian perspective to what scholars have stated in prior research if that is how the findings can be interpreted from your case.

Acknowledge the Study's Limitations You can state the study's limitations in the conclusion section of your paper but describing the limitations of your subject of analysis in the discussion section provides an opportunity to identify the limitations and explain why they are not significant. This part of the discussion section should also note any unanswered questions or issues your case study could not address. More detailed information about how to document any limitations to your research can be found here .

Suggest Areas for Further Research Although your case study may offer important insights about the research problem, there are likely additional questions related to the problem that remain unanswered or findings that unexpectedly revealed themselves as a result of your in-depth analysis of the case. Be sure that the recommendations for further research are linked to the research problem and that you explain why your recommendations are valid in other contexts and based on the original assumptions of your study.

V.  Conclusion

As with any research paper, you should summarize your conclusion in clear, simple language; emphasize how the findings from your case study differs from or supports prior research and why. Do not simply reiterate the discussion section. Provide a synthesis of key findings presented in the paper to show how these converge to address the research problem. If you haven't already done so in the discussion section, be sure to document the limitations of your case study and any need for further research.

The function of your paper's conclusion is to: 1) reiterate the main argument supported by the findings from your case study; 2) state clearly the context, background, and necessity of pursuing the research problem using a case study design in relation to an issue, controversy, or a gap found from reviewing the literature; and, 3) provide a place to persuasively and succinctly restate the significance of your research problem, given that the reader has now been presented with in-depth information about the topic.

Consider the following points to help ensure your conclusion is appropriate:

• If the argument or purpose of your paper is complex, you may need to summarize these points for your reader.
• If prior to your conclusion, you have not yet explained the significance of your findings or if you are proceeding inductively, use the conclusion of your paper to describe your main points and explain their significance.
• Move from a detailed to a general level of consideration of the case study's findings that returns the topic to the context provided by the introduction or within a new context that emerges from your case study findings.

Note that, depending on the discipline you are writing in or the preferences of your professor, the concluding paragraph may contain your final reflections on the evidence presented as it applies to practice or on the essay's central research problem. However, the nature of being introspective about the subject of analysis you have investigated will depend on whether you are explicitly asked to express your observations in this way.

Problems to Avoid

Overgeneralization One of the goals of a case study is to lay a foundation for understanding broader trends and issues applied to similar circumstances. However, be careful when drawing conclusions from your case study. They must be evidence-based and grounded in the results of the study; otherwise, it is merely speculation. Looking at a prior example, it would be incorrect to state that a factor in improving girls access to education in Azerbaijan and the policy implications this may have for improving access in other Muslim nations is due to girls access to social media if there is no documentary evidence from your case study to indicate this. There may be anecdotal evidence that retention rates were better for girls who were engaged with social media, but this observation would only point to the need for further research and would not be a definitive finding if this was not a part of your original research agenda.

Failure to Document Limitations No case is going to reveal all that needs to be understood about a research problem. Therefore, just as you have to clearly state the limitations of a general research study , you must describe the specific limitations inherent in the subject of analysis. For example, the case of studying how women conceptualize the need for water conservation in a village in Uganda could have limited application in other cultural contexts or in areas where fresh water from rivers or lakes is plentiful and, therefore, conservation is understood more in terms of managing access rather than preserving access to a scarce resource.

Failure to Extrapolate All Possible Implications Just as you don't want to over-generalize from your case study findings, you also have to be thorough in the consideration of all possible outcomes or recommendations derived from your findings. If you do not, your reader may question the validity of your analysis, particularly if you failed to document an obvious outcome from your case study research. For example, in the case of studying the accident at the railroad crossing to evaluate where and what types of warning signals should be located, you failed to take into consideration speed limit signage as well as warning signals. When designing your case study, be sure you have thoroughly addressed all aspects of the problem and do not leave gaps in your analysis that leave the reader questioning the results.

Case Studies. Writing@CSU. Colorado State University; Gerring, John. Case Study Research: Principles and Practices . New York: Cambridge University Press, 2007; Merriam, Sharan B. Qualitative Research and Case Study Applications in Education . Rev. ed. San Francisco, CA: Jossey-Bass, 1998; Miller, Lisa L. “The Use of Case Studies in Law and Social Science Research.” Annual Review of Law and Social Science 14 (2018): TBD; Mills, Albert J., Gabrielle Durepos, and Eiden Wiebe, editors. Encyclopedia of Case Study Research . Thousand Oaks, CA: SAGE Publications, 2010; Putney, LeAnn Grogan. "Case Study." In Encyclopedia of Research Design , Neil J. Salkind, editor. (Thousand Oaks, CA: SAGE Publications, 2010), pp. 116-120; Simons, Helen. Case Study Research in Practice . London: SAGE Publications, 2009;  Kratochwill,  Thomas R. and Joel R. Levin, editors. Single-Case Research Design and Analysis: New Development for Psychology and Education .  Hilldsale, NJ: Lawrence Erlbaum Associates, 1992; Swanborn, Peter G. Case Study Research: What, Why and How? London : SAGE, 2010; Yin, Robert K. Case Study Research: Design and Methods . 6th edition. Los Angeles, CA, SAGE Publications, 2014; Walo, Maree, Adrian Bull, and Helen Breen. “Achieving Economic Benefits at Local Events: A Case Study of a Local Sports Event.” Festival Management and Event Tourism 4 (1996): 95-106.

Writing Tip

At Least Five Misconceptions about Case Study Research

Social science case studies are often perceived as limited in their ability to create new knowledge because they are not randomly selected and findings cannot be generalized to larger populations. Flyvbjerg examines five misunderstandings about case study research and systematically "corrects" each one. To quote, these are:

Misunderstanding 1 :  General, theoretical [context-independent] knowledge is more valuable than concrete, practical [context-dependent] knowledge. Misunderstanding 2 :  One cannot generalize on the basis of an individual case; therefore, the case study cannot contribute to scientific development. Misunderstanding 3 :  The case study is most useful for generating hypotheses; that is, in the first stage of a total research process, whereas other methods are more suitable for hypotheses testing and theory building. Misunderstanding 4 :  The case study contains a bias toward verification, that is, a tendency to confirm the researcher’s preconceived notions. Misunderstanding 5 :  It is often difficult to summarize and develop general propositions and theories on the basis of specific case studies [p. 221].

While writing your paper, think introspectively about how you addressed these misconceptions because to do so can help you strengthen the validity and reliability of your research by clarifying issues of case selection, the testing and challenging of existing assumptions, the interpretation of key findings, and the summation of case outcomes. Think of a case study research paper as a complete, in-depth narrative about the specific properties and key characteristics of your subject of analysis applied to the research problem.

Flyvbjerg, Bent. “Five Misunderstandings About Case-Study Research.” Qualitative Inquiry 12 (April 2006): 219-245.

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What Is a Case Study?

Weighing the pros and cons of this method of research

Verywell / Colleen Tighe

• Pros and Cons

What Types of Case Studies Are Out There?

Where do you find data for a case study, how do i write a psychology case study.

A case study is an in-depth study of one person, group, or event. In a case study, nearly every aspect of the subject's life and history is analyzed to seek patterns and causes of behavior. Case studies can be used in many different fields, including psychology, medicine, education, anthropology, political science, and social work.

The point of a case study is to learn as much as possible about an individual or group so that the information can be generalized to many others. Unfortunately, case studies tend to be highly subjective, and it is sometimes difficult to generalize results to a larger population.

While case studies focus on a single individual or group, they follow a format similar to other types of psychology writing. If you are writing a case study, we got you—here are some rules of APA format to reference.  

At a Glance

A case study, or an in-depth study of a person, group, or event, can be a useful research tool when used wisely. In many cases, case studies are best used in situations where it would be difficult or impossible for you to conduct an experiment. They are helpful for looking at unique situations and allow researchers to gather a lot of˜ information about a specific individual or group of people. However, it's important to be cautious of any bias we draw from them as they are highly subjective.

What Are the Benefits and Limitations of Case Studies?

A case study can have its strengths and weaknesses. Researchers must consider these pros and cons before deciding if this type of study is appropriate for their needs.

One of the greatest advantages of a case study is that it allows researchers to investigate things that are often difficult or impossible to replicate in a lab. Some other benefits of a case study:

• Allows researchers to capture information on the 'how,' 'what,' and 'why,' of something that's implemented
• Gives researchers the chance to collect information on why one strategy might be chosen over another
• Permits researchers to develop hypotheses that can be explored in experimental research

On the other hand, a case study can have some drawbacks:

• It cannot necessarily be generalized to the larger population
• Cannot demonstrate cause and effect
• It may not be scientifically rigorous
• It can lead to bias

Researchers may choose to perform a case study if they want to explore a unique or recently discovered phenomenon. Through their insights, researchers develop additional ideas and study questions that might be explored in future studies.

It's important to remember that the insights from case studies cannot be used to determine cause-and-effect relationships between variables. However, case studies may be used to develop hypotheses that can then be addressed in experimental research.

Case Study Examples

There have been a number of notable case studies in the history of psychology. Much of  Freud's work and theories were developed through individual case studies. Some great examples of case studies in psychology include:

• Anna O : Anna O. was a pseudonym of a woman named Bertha Pappenheim, a patient of a physician named Josef Breuer. While she was never a patient of Freud's, Freud and Breuer discussed her case extensively. The woman was experiencing symptoms of a condition that was then known as hysteria and found that talking about her problems helped relieve her symptoms. Her case played an important part in the development of talk therapy as an approach to mental health treatment.
• Phineas Gage : Phineas Gage was a railroad employee who experienced a terrible accident in which an explosion sent a metal rod through his skull, damaging important portions of his brain. Gage recovered from his accident but was left with serious changes in both personality and behavior.
• Genie : Genie was a young girl subjected to horrific abuse and isolation. The case study of Genie allowed researchers to study whether language learning was possible, even after missing critical periods for language development. Her case also served as an example of how scientific research may interfere with treatment and lead to further abuse of vulnerable individuals.

Such cases demonstrate how case research can be used to study things that researchers could not replicate in experimental settings. In Genie's case, her horrific abuse denied her the opportunity to learn a language at critical points in her development.

This is clearly not something researchers could ethically replicate, but conducting a case study on Genie allowed researchers to study phenomena that are otherwise impossible to reproduce.

There are a few different types of case studies that psychologists and other researchers might use:

• Collective case studies : These involve studying a group of individuals. Researchers might study a group of people in a certain setting or look at an entire community. For example, psychologists might explore how access to resources in a community has affected the collective mental well-being of those who live there.
• Descriptive case studies : These involve starting with a descriptive theory. The subjects are then observed, and the information gathered is compared to the pre-existing theory.
• Explanatory case studies : These   are often used to do causal investigations. In other words, researchers are interested in looking at factors that may have caused certain things to occur.
• Exploratory case studies : These are sometimes used as a prelude to further, more in-depth research. This allows researchers to gather more information before developing their research questions and hypotheses .
• Instrumental case studies : These occur when the individual or group allows researchers to understand more than what is initially obvious to observers.
• Intrinsic case studies : This type of case study is when the researcher has a personal interest in the case. Jean Piaget's observations of his own children are good examples of how an intrinsic case study can contribute to the development of a psychological theory.

The three main case study types often used are intrinsic, instrumental, and collective. Intrinsic case studies are useful for learning about unique cases. Instrumental case studies help look at an individual to learn more about a broader issue. A collective case study can be useful for looking at several cases simultaneously.

The type of case study that psychology researchers use depends on the unique characteristics of the situation and the case itself.

There are a number of different sources and methods that researchers can use to gather information about an individual or group. Six major sources that have been identified by researchers are:

• Archival records : Census records, survey records, and name lists are examples of archival records.
• Direct observation : This strategy involves observing the subject, often in a natural setting . While an individual observer is sometimes used, it is more common to utilize a group of observers.
• Documents : Letters, newspaper articles, administrative records, etc., are the types of documents often used as sources.
• Interviews : Interviews are one of the most important methods for gathering information in case studies. An interview can involve structured survey questions or more open-ended questions.
• Participant observation : When the researcher serves as a participant in events and observes the actions and outcomes, it is called participant observation.
• Physical artifacts : Tools, objects, instruments, and other artifacts are often observed during a direct observation of the subject.

If you have been directed to write a case study for a psychology course, be sure to check with your instructor for any specific guidelines you need to follow. If you are writing your case study for a professional publication, check with the publisher for their specific guidelines for submitting a case study.

Here is a general outline of what should be included in a case study.

Section 1: A Case History

This section will have the following structure and content:

Background information : The first section of your paper will present your client's background. Include factors such as age, gender, work, health status, family mental health history, family and social relationships, drug and alcohol history, life difficulties, goals, and coping skills and weaknesses.

Description of the presenting problem : In the next section of your case study, you will describe the problem or symptoms that the client presented with.

Describe any physical, emotional, or sensory symptoms reported by the client. Thoughts, feelings, and perceptions related to the symptoms should also be noted. Any screening or diagnostic assessments that are used should also be described in detail and all scores reported.

Your diagnosis : Provide your diagnosis and give the appropriate Diagnostic and Statistical Manual code. Explain how you reached your diagnosis, how the client's symptoms fit the diagnostic criteria for the disorder(s), or any possible difficulties in reaching a diagnosis.

Section 2: Treatment Plan

This portion of the paper will address the chosen treatment for the condition. This might also include the theoretical basis for the chosen treatment or any other evidence that might exist to support why this approach was chosen.

• Cognitive behavioral approach : Explain how a cognitive behavioral therapist would approach treatment. Offer background information on cognitive behavioral therapy and describe the treatment sessions, client response, and outcome of this type of treatment. Make note of any difficulties or successes encountered by your client during treatment.
• Humanistic approach : Describe a humanistic approach that could be used to treat your client, such as client-centered therapy . Provide information on the type of treatment you chose, the client's reaction to the treatment, and the end result of this approach. Explain why the treatment was successful or unsuccessful.
• Psychoanalytic approach : Describe how a psychoanalytic therapist would view the client's problem. Provide some background on the psychoanalytic approach and cite relevant references. Explain how psychoanalytic therapy would be used to treat the client, how the client would respond to therapy, and the effectiveness of this treatment approach.
• Pharmacological approach : If treatment primarily involves the use of medications, explain which medications were used and why. Provide background on the effectiveness of these medications and how monotherapy may compare with an approach that combines medications with therapy or other treatments.

This section of a case study should also include information about the treatment goals, process, and outcomes.

When you are writing a case study, you should also include a section where you discuss the case study itself, including the strengths and limitiations of the study. You should note how the findings of your case study might support previous research. 

In your discussion section, you should also describe some of the implications of your case study. What ideas or findings might require further exploration? How might researchers go about exploring some of these questions in additional studies?

Need More Tips?

Here are a few additional pointers to keep in mind when formatting your case study:

• Never refer to the subject of your case study as "the client." Instead, use their name or a pseudonym.
• Read examples of case studies to gain an idea about the style and format.
• Remember to use APA format when citing references .

Crowe S, Cresswell K, Robertson A, Huby G, Avery A, Sheikh A. The case study approach .  BMC Med Res Methodol . 2011;11:100.

Crowe S, Cresswell K, Robertson A, Huby G, Avery A, Sheikh A. The case study approach . BMC Med Res Methodol . 2011 Jun 27;11:100. doi:10.1186/1471-2288-11-100

Gagnon, Yves-Chantal.  The Case Study as Research Method: A Practical Handbook . Canada, Chicago Review Press Incorporated DBA Independent Pub Group, 2010.

Yin, Robert K. Case Study Research and Applications: Design and Methods . United States, SAGE Publications, 2017.

By Kendra Cherry, MSEd Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

How to Make Case Study Videos in 10 Steps [Examples Included]

Confidence in your brand is important, but it’s only the beginning. To make a real impact, you need to back up your claims with solid proof. That’s where case study videos come in. Let your satisfied customers do the talking giving new leads an authentic view into your products and services. Let’s look at how to create case study videos easily.

Article Last Updated: August 23, 2024

What is a Case Study Video?

Types of case study videos, why are case study videos important, how and where to use your case study video, how to create an impactful case study video.

Who doesn’t enjoy a captivating story? That’s likely why case study videos have become so popular. They’re more than just stories as they offer a deep dive into real-world scenarios, featuring genuine people and authentic businesses. Through these videos, companies showcase the real impact of their products and services, whether it’s through documenting product development , cultural shifts, or community impact.

To bring these stories to life, tools like Zight can be incredibly useful. With Zight’s features like screen recording , GIF creation , and easy file sharing , you can capture every moment and detail seamlessly. Imagine using Zight to record a customer’s success journey or create engaging visuals to complement your narrative. It’s all about making your case study videos as compelling and impactful as possible.

The question is, what does a good case study video look like? Our guide below will cover every aspect of case study videos, from their purpose, creating compelling videos, exploring what makes them successful, and sharing practical case study video examples and tips to help you craft impactful case study videos that resonate and drive results. Let’s get into it.

A case study video is a type of video content that demonstrates how other people are successfully using and benefiting from a product. It focuses on real customer success stories to show the value of a company’s products or services. In a crowded market of claims and promises, these videos serve as credible proof that your business delivers on its promises.

The strength of a case study video comes from its relatability. When potential customers see themselves in your stories, it fosters a true connection. Seeing real people handle challenges makes your business appear more trustworthy and your solutions more appealing. After all, who could offer a more credible opinion to potential customers than someone who’s experienced your services firsthand?

How is a Video Case Study Different From a Written Case Study?

Both written and video case studies aim to convert customers, but video case studies have several specific advantages:

• More Persuasive : While written case studies require readers to interpret the message, video case studies present it directly from the customer, making the impact more immediate and convincing.
• More Engaging : Videos captivate with dynamic visuals, vibrant colors, and sound, making them far more engaging than dense blocks of text. Who wouldn’t prefer a lively video over a long read?
• Higher Conversion Rates : Video marketing campaigns are very effective. It’s not surprising, given how seamlessly videos can be optimized for mobile devices—something text-heavy content struggles with.

Like in any film or video genre, you’ll notice certain styles and tones that recur frequently. This is also true for case study videos, where you’ll come across several common types as you explore case study videos.

That said, there are different types of case study videos that your business can produce, with different levels of complexity. Each type of case study video has a specific customer problem and appeals to different aspects of your audience’s decision-making process. Depending on your objectives and the topic, choosing the right style of case study video can effectively communicate the message you want to share.

1. Customer Testimonials

This type of video is quite simple to make and is one of the easiest case study videos to make. In customer testimonial videos, you interview your happy customers about their experience with your business and its impact on their lives. Since it involves just a straightforward interview with the customer, you only need one filming location and minimal editing to create the video.

Product or service review case study videos provide a thorough look at your offering’s features, functionality, and benefits. They offer an objective assessment and serve as valuable resources for new customers.

Target Audience : These videos target potential customers who are researching your product or service and need detailed information to make an informed decision.

Testimonial Video Example:

This video is a standout example of customer testimonials. Instead of simply listing features, the interviews highlight the challenges the company faced and how Zoom provided effective solutions . The video’s concise length keeps viewers engaged while still delivering a complete and compelling story in one location.

2. Customer Reviews

Customer reviews are authentic insights that highlight a product’s real-world performance. Much like a customer testimonial video, a customer review video features a happy customer discussing your product or service. However, there’s a key difference: in a customer review video, the customer focuses more on the specific features of the product or service, rather than just the value it provided them.

Depending on your approach, such videos may include footage of the customer using your product on camera. Generally, most case study video testimonials follow a Q&A style of storytelling .

Creating a customer review video is straightforward. The interview portion requires just one shoot location and minimal editing. If you decide to add footage of the product in action, the shoot and editing process will be more complex.

Target Audience : These videos are aimed at potential customers who are actively researching your product or service. They provide detailed information to help them make an informed purchase decision.

Customer Reviews Case Study Video Example:

This customer review case study video features Lana Blakely who explains how Notion has transformed her personal and professional life. She breaks down specific features like databases, templates, and task management tools, showing real-life examples of how she uses the app to stay organized. The video includes screen recordings of how she navigates the Notion workspace, providing viewers with a visual understanding of how the platform functions. Any potential customer actively looking for Notion will find information about the tool and can be able to make an informed decision.

3. Case Study Narrative

This is the most complex type of case study video. A case study narrative video involves on-camera interviews with customers and B-roll visuals, such as footage of the customer using your product or your team engaging with the customer. Additionally, these videos often incorporate graphics and text overlays. Due to its complexity, creating this type of video content demands more shoot time, strategic planning, and extensive editing .

Narrative case study videos focus on storytelling , aiming to engage viewers emotionally by presenting a compelling narrative highlighting a customer’s journey from problem to solution, often emphasizing the transformative aspects.

Target Audience : Narrative case study videos are particularly effective for creating an emotional connection with viewers, engaging a wide range of audiences, including those in the awareness and consideration stages.

Case Study Narrative Video Example:

This video by LLLLITL is a case study of Dove’s “Turn Your Back” campaign, which was designed to raise awareness about the issue of body image. The video uses powerful storytelling to connect with viewers on an emotional level.

Case study videos can significantly enhance your video marketing strategy , particularly for B2B companies . They provide a rich, multi-faceted way to showcase a product or service and offer benefits beyond financial gains. Here is why they are important:

• Credibility and Trust : Case study videos provide authentic success stories that show how your products or services have made a real difference for customers. This helps build trust and credibility with potential clients.
• Engagement : Videos naturally draw people in more effectively than text or static images. With a case study video, you can tell a compelling story that keeps your audience engaged and interested.
• Demonstration of Expertise : These videos allow you to highlight your industry knowledge and position yourself as an expert. By showcasing real-world results, you establish your business as a reliable solution provider.
• Problem-Solution Narrative : Case study videos often follow a clear problem-solving structure, helping potential customers relate to the challenges and see how your product or service can address their needs.
• Personal Connection : Featuring customer interviews or testimonials adds a personal touch. Prospective clients can connect with real people who have benefited from your offerings, making your brand more relatable.
• Versatility : Case study videos are highly versatile and can be used across various platforms , including your website, social media channels, email marketing , and presentations . This ensures your success stories reach a broad audience.
• Measurable Impact : Including data and metrics in your videos demonstrates the tangible results achieved by your clients. This evidence of ROI can be very persuasive for potential customers.
• Lead Generation : Well-crafted case study videos can generate leads by addressing problems similar to those your potential customers face, making them valuable assets in your video marketing strategy.
• Storytelling : Effective visual storytelling in case study videos helps forge an emotional connection with your audience, making your brand memorable and engaging.

After perfecting your case study video, it’s time to share it with your target audience. But where should you promote it?

• Your Website – Embed the video prominently on your website’s homepag e or a dedicated landing page to make it easily accessible. Consider having a section just for case studies, giving prospects a convenient reference point.
• Social Media – Share the video on your company’s social media platforms like Facebook , Twitter, LinkedIn, Instagram, and YouTube . Optimize it for each platform and actively engage with your audience through comments, likes, and shares to boost its visibility.
• Email Marketing – Include the video in your email marketing campaigns , especially targeting those interested in the topic. Adding the video to your email signature can also create a dynamic touchpoint.
• Sales and Marketing Presentations – Integrate the video into your sales pitches and marketing presentations . Real-world examples of success can be highly persuasive during client interactions.
• Content Marketing – Use the video in blog posts, articles, or other written content related to the case study’s topic. Create videos as teaser content from snippets to pique interest and direct viewers to the full video for more details.

Now that you have seen some examples of case study videos, you can now create your case study video. Case studies don’t always stick to a strict timeline or template, but some key steps are usually involved in creating a case study video. Follow these steps to create an engaging case study video that will resonate with your audience.

1. Identify the Right Story

The first step in crafting an attention-grabbing case study video is selecting the right story. You need a story that resonates with your target audience and showcases clear results.

For instance, if you run a software company like Zight, don’t just feature any client who used your software. Highlight businesses that experienced a boost in efficiency with your platform . Numbers like these provide concrete proof of your product’s effectiveness.

Your audience is looking for solutions, so your story should present a compelling example of how you’ve delivered just that. A thoughtfully chosen story sets the stage for a truly engaging case study video.

2. Ask Important Questions

The next key step is to craft the right questions. These will be the basis of your case study video.

• Start by setting the scene for your viewers : Ask about the customer’s initial problem. For example, “What issues were you dealing with before using our product?”
• Then, dive into the specifics : Analyze the customer’s decision-making process with questions like, “What pulled you to our product instead of others?”
• Finally, highlight the results : Ask questions such as, “How has our product made a difference in your operations?” or “Would you recommend our service to others?”

This thoughtful questioning will help create a well-rounded story, listing the problem, the solution, and the impact of your product or service.

3. Choose the Right Audience

You might have a great customer success story and perfectly crafted questions, but they won’t make an impact if they don’t resonate with your target audience’s needs and interests.

Imagine you’re showcasing Zight. Your audience could range from tech-savvy professionals to small business owners who aren’t as familiar with advanced tools. If your case study highlights a large corporation using Zight’s advanced features , it might not connect with a small business owner looking for simple and effective screen recording solutions .

Before diving in, do some audience research. What challenges are they facing? What solutions are they after? Tailor your case study video to address these, using language and examples that speak directly to their needs.

4. Plan Out the Storyline

To craft an engaging storyline for your case study video, you need to guide the viewer through a story that resonates. Start with a compelling introduction that highlights a common problem your audience faces, making it instantly relatable.

For instance, if you’re showcasing Zight, an issue could be the struggle businesses face with lengthy communication chains that slow down decision-making. Many teams feel this pain, making it an effective hook. Then, introduce Zight as the solution. This is where you spotlight its unique features—like screen recording and sharing capabilities—that streamline communication and boost productivity .

Support your claims with testimonials or expert opinions to add credibility. Hearing from satisfied users can make a significant impact.

Finally, wrap up by showcasing measurable results . Use statistics or before-and-after comparisons to emphasize how Zight made a difference. Conclude with a clear call-to-action, guiding the viewer on what steps to take next.

5. Conduct Background Interviews

Conducting background interviews is essential before you start filming. These pre-shoot conversations offer valuable insights that can enhance your storyline. They help you understand the full scope of the customer’s experience , adding richness and depth to your case study video.

These interviews also help you identify key talking points and decide who should be featured in the video. Whether it’s the CEO providing strategic insights or a front-line employee sharing day-to-day benefits, understanding this in advance ensures you capture the most relevant content, saving you time and effort during production.

6. Develop Your Script

The video script is the backbone to create engaging video content, pulling together visuals, dialogue, and pacing to create a cohesive story. Here’s how to craft one that leaves an impact:

• Start by outlining the key points you’ve gathered from background interviews and your storyline.
• Be clear and specific—rather than saying, “Our product is great,” highlight its strengths with something like, “Our software boosts productivity by 40%.”
• Keep the tone conversational yet professional to ensure your message resonates.
• Make sure the script flows smoothly, making complex ideas easy to understand.
• Consider using bullet points or numbered lists to emphasize key features or benefits.

Wrap up with a compelling call-to-action , guiding viewers on what to do next, whether that’s visiting your website or reaching out to your sales team.

7. Back it up with Data

Including data and statistics adds credibility to your case study video. While a compelling story captures attention, solid data reinforces your claims and makes your video campaigns more convincing.

Incorporate charts, graphs, or other visuals to present the data. Visual elements help make complex information more digestible and memorable. Ensure the data aligns with your storyline and addresses the needs or concerns of your audience.

8. Select the Right Location

The location you choose for your case study video adds depth and context to your story. Opt for a setting that complements the narrative and enhances its authenticity. For instance, if your case study involves educational software, filming in a classroom or school can make the story feel more genuine.

Your location should also resonate with your audience. Remember to consider practical aspects like lighting , sound, and permissions. The perfect location can fall flat if it has poor acoustics or requires difficult-to-obtain permits.

9. Create a Shot List

A carefully planned shot list is essential for a smooth filming experience. It details every shot you need, acting as a guide for your production team.

For example, if you’re capturing a customer testimonial, your shot list might include:

• Close-ups of the customer speaking
• Cutaways of the product in action
• Wide-angle shots to set the scene

Your shot list should specify the type of shots—wide, medium, or close-up—and any particular camera movements like pans or zooms. This ensures you capture all the crucial elements of your video marketing campaign from product details to emotional moments.

A shot list also helps you manage time and resources efficiently, allowing you to anticipate special equipment or lighting needs ahead of time, and preventing last-minute scrambling.

10. Shoot and Edit

This is where all your planning comes to life. Stick to your shot list and script during the shoot, but be open to capturing spontaneous moments that could enhance the story. High-quality equipment is necessary for clear audio and well-lit scenes —these technical details can elevate your final product.

Editing is where you shape the story , choosing the best shots to create a compelling narrative. Use cutaways, transitions, and background music to keep the pacing dynamic and the viewer engaged.

Pay attention to color grading, sound mixing, and special effects, ensuring they match the tone and message of your video. Avoid overdoing effects, as they can easily overshadow the content.

Now that you’ve seen how major brands craft their case study videos, let these examples spark ideas for your own. Use them to motivate your sales team , improve your video marketing strategy, and captivate your audience.

In addition, incorporating tools like Zight offers practical solutions such as screen recording and GIF creation, these videos not only tell a compelling story but also demonstrate how your product can deliver tangible results. What are you waiting for? Sign up and get started .

Create & share screenshots, screen recordings, and GIFs with Zight

Get Zight for iOS.

• Open access
• Published: 27 June 2011

The case study approach

• Sarah Crowe 1 ,
• Kathrin Cresswell 2 ,
• Ann Robertson 2 ,
• Guro Huby 3 ,
• Anthony Avery 1 &
• Aziz Sheikh 2  

BMC Medical Research Methodology volume  11 , Article number:  100 ( 2011 ) Cite this article

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The case study approach allows in-depth, multi-faceted explorations of complex issues in their real-life settings. The value of the case study approach is well recognised in the fields of business, law and policy, but somewhat less so in health services research. Based on our experiences of conducting several health-related case studies, we reflect on the different types of case study design, the specific research questions this approach can help answer, the data sources that tend to be used, and the particular advantages and disadvantages of employing this methodological approach. The paper concludes with key pointers to aid those designing and appraising proposals for conducting case study research, and a checklist to help readers assess the quality of case study reports.

Peer Review reports

Introduction

The case study approach is particularly useful to employ when there is a need to obtain an in-depth appreciation of an issue, event or phenomenon of interest, in its natural real-life context. Our aim in writing this piece is to provide insights into when to consider employing this approach and an overview of key methodological considerations in relation to the design, planning, analysis, interpretation and reporting of case studies.

The illustrative 'grand round', 'case report' and 'case series' have a long tradition in clinical practice and research. Presenting detailed critiques, typically of one or more patients, aims to provide insights into aspects of the clinical case and, in doing so, illustrate broader lessons that may be learnt. In research, the conceptually-related case study approach can be used, for example, to describe in detail a patient's episode of care, explore professional attitudes to and experiences of a new policy initiative or service development or more generally to 'investigate contemporary phenomena within its real-life context' [ 1 ]. Based on our experiences of conducting a range of case studies, we reflect on when to consider using this approach, discuss the key steps involved and illustrate, with examples, some of the practical challenges of attaining an in-depth understanding of a 'case' as an integrated whole. In keeping with previously published work, we acknowledge the importance of theory to underpin the design, selection, conduct and interpretation of case studies[ 2 ]. In so doing, we make passing reference to the different epistemological approaches used in case study research by key theoreticians and methodologists in this field of enquiry.

This paper is structured around the following main questions: What is a case study? What are case studies used for? How are case studies conducted? What are the potential pitfalls and how can these be avoided? We draw in particular on four of our own recently published examples of case studies (see Tables 1 , 2 , 3 and 4 ) and those of others to illustrate our discussion[ 3 – 7 ].

What is a case study?

A case study is a research approach that is used to generate an in-depth, multi-faceted understanding of a complex issue in its real-life context. It is an established research design that is used extensively in a wide variety of disciplines, particularly in the social sciences. A case study can be defined in a variety of ways (Table 5 ), the central tenet being the need to explore an event or phenomenon in depth and in its natural context. It is for this reason sometimes referred to as a "naturalistic" design; this is in contrast to an "experimental" design (such as a randomised controlled trial) in which the investigator seeks to exert control over and manipulate the variable(s) of interest.

Stake's work has been particularly influential in defining the case study approach to scientific enquiry. He has helpfully characterised three main types of case study: intrinsic , instrumental and collective [ 8 ]. An intrinsic case study is typically undertaken to learn about a unique phenomenon. The researcher should define the uniqueness of the phenomenon, which distinguishes it from all others. In contrast, the instrumental case study uses a particular case (some of which may be better than others) to gain a broader appreciation of an issue or phenomenon. The collective case study involves studying multiple cases simultaneously or sequentially in an attempt to generate a still broader appreciation of a particular issue.

These are however not necessarily mutually exclusive categories. In the first of our examples (Table 1 ), we undertook an intrinsic case study to investigate the issue of recruitment of minority ethnic people into the specific context of asthma research studies, but it developed into a instrumental case study through seeking to understand the issue of recruitment of these marginalised populations more generally, generating a number of the findings that are potentially transferable to other disease contexts[ 3 ]. In contrast, the other three examples (see Tables 2 , 3 and 4 ) employed collective case study designs to study the introduction of workforce reconfiguration in primary care, the implementation of electronic health records into hospitals, and to understand the ways in which healthcare students learn about patient safety considerations[ 4 – 6 ]. Although our study focusing on the introduction of General Practitioners with Specialist Interests (Table 2 ) was explicitly collective in design (four contrasting primary care organisations were studied), is was also instrumental in that this particular professional group was studied as an exemplar of the more general phenomenon of workforce redesign[ 4 ].

What are case studies used for?

According to Yin, case studies can be used to explain, describe or explore events or phenomena in the everyday contexts in which they occur[ 1 ]. These can, for example, help to understand and explain causal links and pathways resulting from a new policy initiative or service development (see Tables 2 and 3 , for example)[ 1 ]. In contrast to experimental designs, which seek to test a specific hypothesis through deliberately manipulating the environment (like, for example, in a randomised controlled trial giving a new drug to randomly selected individuals and then comparing outcomes with controls),[ 9 ] the case study approach lends itself well to capturing information on more explanatory ' how ', 'what' and ' why ' questions, such as ' how is the intervention being implemented and received on the ground?'. The case study approach can offer additional insights into what gaps exist in its delivery or why one implementation strategy might be chosen over another. This in turn can help develop or refine theory, as shown in our study of the teaching of patient safety in undergraduate curricula (Table 4 )[ 6 , 10 ]. Key questions to consider when selecting the most appropriate study design are whether it is desirable or indeed possible to undertake a formal experimental investigation in which individuals and/or organisations are allocated to an intervention or control arm? Or whether the wish is to obtain a more naturalistic understanding of an issue? The former is ideally studied using a controlled experimental design, whereas the latter is more appropriately studied using a case study design.

Case studies may be approached in different ways depending on the epistemological standpoint of the researcher, that is, whether they take a critical (questioning one's own and others' assumptions), interpretivist (trying to understand individual and shared social meanings) or positivist approach (orientating towards the criteria of natural sciences, such as focusing on generalisability considerations) (Table 6 ). Whilst such a schema can be conceptually helpful, it may be appropriate to draw on more than one approach in any case study, particularly in the context of conducting health services research. Doolin has, for example, noted that in the context of undertaking interpretative case studies, researchers can usefully draw on a critical, reflective perspective which seeks to take into account the wider social and political environment that has shaped the case[ 11 ].

How are case studies conducted?

Here, we focus on the main stages of research activity when planning and undertaking a case study; the crucial stages are: defining the case; selecting the case(s); collecting and analysing the data; interpreting data; and reporting the findings.

Defining the case

Carefully formulated research question(s), informed by the existing literature and a prior appreciation of the theoretical issues and setting(s), are all important in appropriately and succinctly defining the case[ 8 , 12 ]. Crucially, each case should have a pre-defined boundary which clarifies the nature and time period covered by the case study (i.e. its scope, beginning and end), the relevant social group, organisation or geographical area of interest to the investigator, the types of evidence to be collected, and the priorities for data collection and analysis (see Table 7 )[ 1 ]. A theory driven approach to defining the case may help generate knowledge that is potentially transferable to a range of clinical contexts and behaviours; using theory is also likely to result in a more informed appreciation of, for example, how and why interventions have succeeded or failed[ 13 ].

For example, in our evaluation of the introduction of electronic health records in English hospitals (Table 3 ), we defined our cases as the NHS Trusts that were receiving the new technology[ 5 ]. Our focus was on how the technology was being implemented. However, if the primary research interest had been on the social and organisational dimensions of implementation, we might have defined our case differently as a grouping of healthcare professionals (e.g. doctors and/or nurses). The precise beginning and end of the case may however prove difficult to define. Pursuing this same example, when does the process of implementation and adoption of an electronic health record system really begin or end? Such judgements will inevitably be influenced by a range of factors, including the research question, theory of interest, the scope and richness of the gathered data and the resources available to the research team.

Selecting the case(s)

The decision on how to select the case(s) to study is a very important one that merits some reflection. In an intrinsic case study, the case is selected on its own merits[ 8 ]. The case is selected not because it is representative of other cases, but because of its uniqueness, which is of genuine interest to the researchers. This was, for example, the case in our study of the recruitment of minority ethnic participants into asthma research (Table 1 ) as our earlier work had demonstrated the marginalisation of minority ethnic people with asthma, despite evidence of disproportionate asthma morbidity[ 14 , 15 ]. In another example of an intrinsic case study, Hellstrom et al.[ 16 ] studied an elderly married couple living with dementia to explore how dementia had impacted on their understanding of home, their everyday life and their relationships.

For an instrumental case study, selecting a "typical" case can work well[ 8 ]. In contrast to the intrinsic case study, the particular case which is chosen is of less importance than selecting a case that allows the researcher to investigate an issue or phenomenon. For example, in order to gain an understanding of doctors' responses to health policy initiatives, Som undertook an instrumental case study interviewing clinicians who had a range of responsibilities for clinical governance in one NHS acute hospital trust[ 17 ]. Sampling a "deviant" or "atypical" case may however prove even more informative, potentially enabling the researcher to identify causal processes, generate hypotheses and develop theory.

In collective or multiple case studies, a number of cases are carefully selected. This offers the advantage of allowing comparisons to be made across several cases and/or replication. Choosing a "typical" case may enable the findings to be generalised to theory (i.e. analytical generalisation) or to test theory by replicating the findings in a second or even a third case (i.e. replication logic)[ 1 ]. Yin suggests two or three literal replications (i.e. predicting similar results) if the theory is straightforward and five or more if the theory is more subtle. However, critics might argue that selecting 'cases' in this way is insufficiently reflexive and ill-suited to the complexities of contemporary healthcare organisations.

The selected case study site(s) should allow the research team access to the group of individuals, the organisation, the processes or whatever else constitutes the chosen unit of analysis for the study. Access is therefore a central consideration; the researcher needs to come to know the case study site(s) well and to work cooperatively with them. Selected cases need to be not only interesting but also hospitable to the inquiry [ 8 ] if they are to be informative and answer the research question(s). Case study sites may also be pre-selected for the researcher, with decisions being influenced by key stakeholders. For example, our selection of case study sites in the evaluation of the implementation and adoption of electronic health record systems (see Table 3 ) was heavily influenced by NHS Connecting for Health, the government agency that was responsible for overseeing the National Programme for Information Technology (NPfIT)[ 5 ]. This prominent stakeholder had already selected the NHS sites (through a competitive bidding process) to be early adopters of the electronic health record systems and had negotiated contracts that detailed the deployment timelines.

It is also important to consider in advance the likely burden and risks associated with participation for those who (or the site(s) which) comprise the case study. Of particular importance is the obligation for the researcher to think through the ethical implications of the study (e.g. the risk of inadvertently breaching anonymity or confidentiality) and to ensure that potential participants/participating sites are provided with sufficient information to make an informed choice about joining the study. The outcome of providing this information might be that the emotive burden associated with participation, or the organisational disruption associated with supporting the fieldwork, is considered so high that the individuals or sites decide against participation.

In our example of evaluating implementations of electronic health record systems, given the restricted number of early adopter sites available to us, we sought purposively to select a diverse range of implementation cases among those that were available[ 5 ]. We chose a mixture of teaching, non-teaching and Foundation Trust hospitals, and examples of each of the three electronic health record systems procured centrally by the NPfIT. At one recruited site, it quickly became apparent that access was problematic because of competing demands on that organisation. Recognising the importance of full access and co-operative working for generating rich data, the research team decided not to pursue work at that site and instead to focus on other recruited sites.

Collecting the data

In order to develop a thorough understanding of the case, the case study approach usually involves the collection of multiple sources of evidence, using a range of quantitative (e.g. questionnaires, audits and analysis of routinely collected healthcare data) and more commonly qualitative techniques (e.g. interviews, focus groups and observations). The use of multiple sources of data (data triangulation) has been advocated as a way of increasing the internal validity of a study (i.e. the extent to which the method is appropriate to answer the research question)[ 8 , 18 – 21 ]. An underlying assumption is that data collected in different ways should lead to similar conclusions, and approaching the same issue from different angles can help develop a holistic picture of the phenomenon (Table 2 )[ 4 ].

Brazier and colleagues used a mixed-methods case study approach to investigate the impact of a cancer care programme[ 22 ]. Here, quantitative measures were collected with questionnaires before, and five months after, the start of the intervention which did not yield any statistically significant results. Qualitative interviews with patients however helped provide an insight into potentially beneficial process-related aspects of the programme, such as greater, perceived patient involvement in care. The authors reported how this case study approach provided a number of contextual factors likely to influence the effectiveness of the intervention and which were not likely to have been obtained from quantitative methods alone.

In collective or multiple case studies, data collection needs to be flexible enough to allow a detailed description of each individual case to be developed (e.g. the nature of different cancer care programmes), before considering the emerging similarities and differences in cross-case comparisons (e.g. to explore why one programme is more effective than another). It is important that data sources from different cases are, where possible, broadly comparable for this purpose even though they may vary in nature and depth.

Analysing, interpreting and reporting case studies

Making sense and offering a coherent interpretation of the typically disparate sources of data (whether qualitative alone or together with quantitative) is far from straightforward. Repeated reviewing and sorting of the voluminous and detail-rich data are integral to the process of analysis. In collective case studies, it is helpful to analyse data relating to the individual component cases first, before making comparisons across cases. Attention needs to be paid to variations within each case and, where relevant, the relationship between different causes, effects and outcomes[ 23 ]. Data will need to be organised and coded to allow the key issues, both derived from the literature and emerging from the dataset, to be easily retrieved at a later stage. An initial coding frame can help capture these issues and can be applied systematically to the whole dataset with the aid of a qualitative data analysis software package.

The Framework approach is a practical approach, comprising of five stages (familiarisation; identifying a thematic framework; indexing; charting; mapping and interpretation) , to managing and analysing large datasets particularly if time is limited, as was the case in our study of recruitment of South Asians into asthma research (Table 1 )[ 3 , 24 ]. Theoretical frameworks may also play an important role in integrating different sources of data and examining emerging themes. For example, we drew on a socio-technical framework to help explain the connections between different elements - technology; people; and the organisational settings within which they worked - in our study of the introduction of electronic health record systems (Table 3 )[ 5 ]. Our study of patient safety in undergraduate curricula drew on an evaluation-based approach to design and analysis, which emphasised the importance of the academic, organisational and practice contexts through which students learn (Table 4 )[ 6 ].

Case study findings can have implications both for theory development and theory testing. They may establish, strengthen or weaken historical explanations of a case and, in certain circumstances, allow theoretical (as opposed to statistical) generalisation beyond the particular cases studied[ 12 ]. These theoretical lenses should not, however, constitute a strait-jacket and the cases should not be "forced to fit" the particular theoretical framework that is being employed.

When reporting findings, it is important to provide the reader with enough contextual information to understand the processes that were followed and how the conclusions were reached. In a collective case study, researchers may choose to present the findings from individual cases separately before amalgamating across cases. Care must be taken to ensure the anonymity of both case sites and individual participants (if agreed in advance) by allocating appropriate codes or withholding descriptors. In the example given in Table 3 , we decided against providing detailed information on the NHS sites and individual participants in order to avoid the risk of inadvertent disclosure of identities[ 5 , 25 ].

What are the potential pitfalls and how can these be avoided?

The case study approach is, as with all research, not without its limitations. When investigating the formal and informal ways undergraduate students learn about patient safety (Table 4 ), for example, we rapidly accumulated a large quantity of data. The volume of data, together with the time restrictions in place, impacted on the depth of analysis that was possible within the available resources. This highlights a more general point of the importance of avoiding the temptation to collect as much data as possible; adequate time also needs to be set aside for data analysis and interpretation of what are often highly complex datasets.

Case study research has sometimes been criticised for lacking scientific rigour and providing little basis for generalisation (i.e. producing findings that may be transferable to other settings)[ 1 ]. There are several ways to address these concerns, including: the use of theoretical sampling (i.e. drawing on a particular conceptual framework); respondent validation (i.e. participants checking emerging findings and the researcher's interpretation, and providing an opinion as to whether they feel these are accurate); and transparency throughout the research process (see Table 8 )[ 8 , 18 – 21 , 23 , 26 ]. Transparency can be achieved by describing in detail the steps involved in case selection, data collection, the reasons for the particular methods chosen, and the researcher's background and level of involvement (i.e. being explicit about how the researcher has influenced data collection and interpretation). Seeking potential, alternative explanations, and being explicit about how interpretations and conclusions were reached, help readers to judge the trustworthiness of the case study report. Stake provides a critique checklist for a case study report (Table 9 )[ 8 ].

Conclusions

The case study approach allows, amongst other things, critical events, interventions, policy developments and programme-based service reforms to be studied in detail in a real-life context. It should therefore be considered when an experimental design is either inappropriate to answer the research questions posed or impossible to undertake. Considering the frequency with which implementations of innovations are now taking place in healthcare settings and how well the case study approach lends itself to in-depth, complex health service research, we believe this approach should be more widely considered by researchers. Though inherently challenging, the research case study can, if carefully conceptualised and thoughtfully undertaken and reported, yield powerful insights into many important aspects of health and healthcare delivery.

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Acknowledgements

We are grateful to the participants and colleagues who contributed to the individual case studies that we have drawn on. This work received no direct funding, but it has been informed by projects funded by Asthma UK, the NHS Service Delivery Organisation, NHS Connecting for Health Evaluation Programme, and Patient Safety Research Portfolio. We would also like to thank the expert reviewers for their insightful and constructive feedback. Our thanks are also due to Dr. Allison Worth who commented on an earlier draft of this manuscript.

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Sarah Crowe & Anthony Avery

Centre for Population Health Sciences, The University of Edinburgh, Edinburgh, UK

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AS conceived this article. SC, KC and AR wrote this paper with GH, AA and AS all commenting on various drafts. SC and AS are guarantors.

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Crowe, S., Cresswell, K., Robertson, A. et al. The case study approach. BMC Med Res Methodol 11 , 100 (2011). https://doi.org/10.1186/1471-2288-11-100

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InfoQ Homepage Articles Scaling the Heights: Unveiling the Secrets of Azure Functions’ Cold Starts and Scalability

Scaling the Heights: Unveiling the Secrets of Azure Functions’ Cold Starts and Scalability

Aug 21, 2024 13 min read

Preetam Dasgupta

reviewed by

Steef-Jan Wiggers

Key Takeaways

• Understand cold starts in Azure Functions regarding frequency, duration, and scalability to avoid resource wastage and incorrect optimizations. 
• Reduce a cold start duration by optimizing runtime, memory allocation, and initialization code.
• Manage cold starts with Azure-provided strategies such as pre-warmed instances, code quality improvements, consumption plan scaling, and short-term, low-cost open-source strategies.
• Two real-life production case studies illustrate how investment in cold-start optimization can provide significant business benefits. In one case, cold-start improvements can be traded off for excellence in other key performance metrics.
• Take a holistic view of system scalability beyond just addressing cold starts.

The insightful piece featured on InfoQ delves into the intricacies of Azure Functions’ Cold Starts , illuminating a topic that frequently stirs debate within the serverless computing sphere. With the growing embrace of serverless architectures, discussions around Azure Functions’ cold starts have ignited a firestorm of controversy, giving rise to numerous misconceptions and fostering an environment filled with confusion and less-than-ideal optimization strategies.

The article thoroughly examines the essence of Azure Functions’ cold starts, the conditions that precipitate them, and their consequent impact on application performance.

Additionally, we will investigate various strategies to mitigate the influence of cold starts, arguing that they should not be invariably viewed as a negative aspect. The aim is to clarify the impact of cold starts, thus equipping developers with a clearer understanding of Azure Functions’ cold starts and empowering them to leverage the benefits of serverless computing more effectively. The article presents a case study detailing the development of a low-latency application via Azure Functions. In closing, the discussion extends beyond cold starts to address broader scalability issues in serverless environments.

What Is a Cold Start?

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In the context of Azure Functions, a " cold start " refers to the increased latency experienced when an application that has not been recently used is activated. This latency occurs as a new function instance is initialized in response to an event-based or automated trigger. The duration of a cold start can be influenced by several factors, including the chosen runtime, specific configuration settings, code quality, and the function’s integration with Azure Virtual Network.

Dispelling myths about cold starts is crucial, as they are often mistakenly viewed as a significant disadvantage of serverless computing. A comprehensive understanding of cold starts reveals that their impact is more complex and can be substantially reduced through thoughtful architecture and the right solutions.

Five Common Myths on Cold Start

Myth 1: cold starts have to be mitigated for 100% of cases..

A prevalent belief among many professionals is that a cold start is the most critical challenge in scalability and requires mitigation at all costs. However, this is not a universal necessity. The fundamental consideration is identifying situations where a cold start is inconsequential. For example, an offline job that runs daily to update website image icons, a change that only occurs once every few months. This task does not demand immediate execution or completion. Therefore, cold starts can be disregarded for such low-priority tasks, allowing us to focus our efforts on enhancing overall scalability rather than only cold start issues.

Myth 2: Cold starts are random in terms of occurrence.

The notion that cold starts happening by chance is a common misconception . In truth, cold starts are entirely predictable; the perceived randomness stems from large organizations not disclosing their serverless function initialization strategies. Nevertheless, Azure and other entities are becoming increasingly transparent, offering developers a clearer understanding of the time that containers remain warm post-function initiation or the capacity allocated to each container, which influences the duration of cold starts. 

Myth 3: Cold starts add random seconds to latency.

The belief that a cold start introduces arbitrary seconds of latency is a misconception. While it’s accurate that cold starts can add varying amounts of latency to different applications, these variations are not random. They are determined by many factors, including the quality of the code , the programming language used , the App service plan chosen , and various application settings . Understanding these elements can help manage and minimize the impact of cold starts on latency.

Myth 4: Cold starts mean a function is under-scaled.

The misconception that a cold start indicates a function’s lack of scalability leads many to unnecessarily over-scale to rectify it. While employing dedicated server instances can alleviate cold start issues to a degree since some servers kept "warm" won’t experience cold starts, it’s not a complete solution. For example, if 10% of instances are dedicated, a cold start will still affect the remaining 90%. It’s crucial to recognize that horizontal scaling and cold-start mitigation are two distinct components of a comprehensive scaling strategy and are not interchangeable.

Myth 5: Cold starts cannot be measured.

Contrary to this myth, cold starts in Azure Functions can be quantified and analyzed. Azure Application Insights and Azure Monitor are often pre-configured with Azure Functions, providing insights into performance metrics, including cold-start durations. When they are not automatically set up, a simple configuration with minimal overhead is all that’s needed to get started. Log Streams and Azure Metrics also offer real-time and historical data, providing a comprehensive view of function performance. These tools ensure that cold-start measurements are accessible and actionable, with negligible cost implications. Moreover, other non-azure solutions, such as dynatrace , can offer observability outside the Azure ecosystem.

Visualizing Cold-Start Latency in a Production Function Through Various Methods

In the next phase, we will examine a production function named stockFunction1 to demonstrate the measurement of cold-start latency impacts.

Test Setup: We ensured that stockFunction1 received no HTTP calls for three days. Subsequently, we initiated a series of eight consecutive calls to the function.

Experimental Results: The initial call exhibited a latency of 381ms, attributable to the cold start. All following calls registered latencies under 10ms.

Tools for Visualization: To illustrate this incident, we can use various tools to visualize and predict cold-start latency in functions. Given that cold-start latency varies with each function’s implementation, we focus on applying these tools to ascertain cold-start latency in specific scenarios.

Log Streams and Kusto Queries are fundamental tools for examining Azure Functions invocations. They offer a straightforward method to access comprehensive logs, shedding light on the function execution and pinpointing potential latency concerns. Users can tailor their log view by filtering according to log level and function name, and further analyze the data through chart visualizations. This approach represents the most rudimentary yet effective means to gauge function latency, providing clear visibility into the extent of cold-start latency.

Below are the basic invocation logs of the function, displaying the eight consecutive calls. The first one has a latency of 381ms and subsequent ones less than 10ms.

Below is a Log query that displays the average response time for these eight calls, approximately 50ms.

However, utilizing a distinct log query that categorizes the calls by latency brackets allows us to distinctly identify the cold-start call as an anomaly, particularly since it is the sole call with a latency exceeding 250ms.

Application Insights is a versatile Application Performance Management (APM) service catering to web developers across various platforms. Through the use of Application Insights Performance queries, it is possible to identify specific API calls and their associated latencies, allowing for an in-depth analysis of each individual call.

In the example below, the Performance metrics provide a comprehensive overview of the latency distribution for function calls over time, offering a broad perspective on performance trends and the impact of cold starts.

Below are the detailed views that allow for an in-depth analysis of two end-to-end transactions, specifically function calls, one experiencing a cold start and the other without a cold start.

Azure Functions offers integrated support for tracking key metrics, including the function execution count and response time . These metrics are accessible in the Metrics tab and can be conveniently pinned to the dashboard for quick reference. Regularly monitoring these metrics is instrumental in detecting any latency problems that may arise during function execution. In the example provided, it is evident that the end-to-end latency exceeded 400ms during the initial call, a result of the cold-start effect, and subsequently fell to under 100ms for the following calls.

Four Strategies to Reduce Azure Functions’ Cold Starts

Below are four classes of strategies that one can pursue, either together or separately, to reduce the frequency and duration of a cold start. Implementing these strategies can help mitigate the cold start, leading to a more responsive Azure Functions experience for end users. When choosing the right approach for a specific use case, it’s essential to consider the trade-offs between cost, maintenance, and performance.

Automated function calls, known as " keep-alive " pings, can be scheduled at regular intervals to pre-emptively warm up the function. This strategy ensures that the function app is always running and ready to respond to incoming requests, reducing the likelihood of cold starts. It’s important to align the frequency of these calls with the expected traffic patterns for efficiency and cost-effectiveness.

• Adopt an Opt-In Preloading Strategy: Choose to preload essential assemblies while in placeholder mode to minimize cold starts, which is especially beneficial for those not using custom assemblies.

• Utilize Zip Deploy for Function Deployment: Deploy your functions as compressed artifacts and use pre-warmed workers to expedite the time it takes for an instance to become ready.
• Reduce Function Footprint: Trim down the function’s size by discarding superfluous files and dependencies, diminishing the impact of cold starts.

Upgrading to higher-quality Azure instances can provide better CPU and memory resources, leading to faster start times for Azure Functions. Premium plan instances , for example, offer pre-warmed instances that are always ready to execute, reducing the cold-start latency. While this option may increase costs, it balances out with improved performance and reduced latency.

Dedicated Azure instances , such as those provided in an App Service Environment (ASE) or on an Azure Kubernetes Service (AKS), offer exclusive resources for your functions. This means the functions do not share resources with other tenants, leading to more predictable performance and faster response times. Dedicated instances are ideal for scenarios where consistent performance is critical, and they can be particularly effective in eliminating cold starts.

Case Studies

In this section, we will explore two production case studies. In the first case, investing in cold-start mitigation led to a significant reduction in latency. In the second case, the team prioritized precision and reliability goals for a workflow system over cold-start optimizations.

Case Study 1: Developing an Economical API with Azure Functions for Your Website

This case study delves into creating a high-performance API backend utilizing Azure Functions, focusing on achieving rapid response times. The central objective is to manage cold starts efficiently to ensure the API remains low-latency and cost-effective.

Context and Challenge: In this case, the control plane API was built using Azure Functions, which served as the central system for resource management and orchestration. A key requirement for this system was low latency to ensure prompt API responses, which is vital for seamless operations and a positive user experience. However, serverless architectures based on Azure Functions can encounter cold starts, potentially leading to increased latency.

Strategy and Implementation: To address this, the initial step involved refining the Azure Functions configuration to prioritize low latency. The runtime environment was carefully chosen for its performance efficiency, and memory settings were calibrated to strike an optimal balance between cost and responsiveness. Additionally, the deployment package was streamlined to expedite the download time of the function code, thereby curtailing the cold start duration.

Subsequently, we leveraged Azure’s dedicated instances, which maintain a predetermined number of "warm" function instances. These instances are primed to process invocations immediately, eliminating the latency associated with cold starts. By adjusting the provisioned concurrency levels, we ensured a consistent availability of warm instances to manage the API calls instantaneously. Monitoring the utilization metrics of provisioned concurrency became a crucial aspect of this strategy to prevent any cold path execution due to spillover invocations.

Results: By adopting these strategies, the API server could effectively manage cold starts. The latency of the control Plane API saw a significant reduction [40%], with most API calls being processed by pre-warmed Azure Functions instances. On the occasions that cold starts were encountered, their impact was substantially lessened [120 ms compared to 380 ms] due to meticulous Azure Functions configuration and optimization.

Case Study 2: Build a low-cost offline pipeline for data processing

This case study presents the development of an offline data processing system utilizing Azure Functions and Azure Data Factory. In this scenario, the emphasis is placed on the accuracy and reliability of data processing rather than the optimization of cold starts. It illustrates a context where optimizing for cold starts does not yield performance enhancements and could lead to unnecessary service costs.

Context and Challenge: Tasks are scheduled and executed without immediate action, ideal for batch tasks and complex analytics. Here, the most important metrics were job execution success rate and correctness of the offline jobs rather than the latency.

Strategy and Implementation: The focus was on data processing reliability and precision. As a result, the team chose to forgo cold-start optimizations and directed all development efforts toward achieving higher precision and reliability goals. To ensure resilience and manage complex workflows with large data, we extensively used Azure Durable Functions , which are equivalent to AWS Step Functions . These serverless workflow orchestration services enabled us to coordinate and sequence multiple functions and tasks into well-defined workflows, prioritizing throughput and efficiency over speed.

Results: Implementing a cold-start approach in this scenario would have incurred unnecessary development and financial expenses without yielding any enhancements in specific performance or quality metrics that are valuable to this system.

Beyond Cold Start: Addressing Persistent High Latency in Azure Functions

While addressing cold starts is essential in latency-sensitive applications, it does not completely resolve all latency issues. Cold starts primarily affect the initial few calls, and numerous other factors could contribute to the higher average latency of a system. Therefore, it’s necessary to consider the overall scalability of Azure Functions. The path to achieving the best performance is continuous, and although reducing cold starts is important, it is only a part of the optimization process. Here’s how to continue enhancing your Azure Functions:

By strategically leveraging Azure App’s scaling capabilities, one can efficiently manage increasing traffic. This approach ensures a seamless capacity boost as user demand grows, preventing sudden latency spikes due to resource shortages. It’s a proactive strategy for scalability, ensuring functions are ready to handle incoming loads. Typically, this is achieved through various automatic scaling options within the Azure Functions app service plan. The basic consumption plan involves fine-tuning configuration parameters such as concurrency per instance, memory allocation, and overall capacity. In contrast, the Premium , Dedicated , and Flex Consumption plans offer automated scaling strategies that dynamically adjust to traffic demands.

Understanding and planning for business-specific traffic patterns is essential for optimizing Azure Functions’ capacity and scaling strategies. Here’s an expanded look at some example businesses to identify patterns with added strategic considerations:

Example 1: Financial Trading Platform:

Traffic surges are common at stock markets, stabilize during trading hours, and decrease after the market closes.

Strategy: Implementing a dynamic scaling plan that increases function concurrency in alignment with market hours and scales down during off-peak times, such as weekends or holidays. This could lead to a cost reduction of approximately 20%-30% by avoiding unnecessary resource allocation during low-traffic periods.

Example 2: A Sports App Providing Real-Time Match Notifications:

Live events cause significant traffic spikes, which then level off to a steady flow as fans continue to engage.

Strategy: Adopting a burst concurrency model that can handle sudden traffic increases and utilizes automatic scaling to adjust resources as needed. This ensures that fan engagement is supported without interruption and resources are efficiently managed.

Example 3: A Weather Website:

Traffic is relatively consistent throughout the day with occasional spikes.

Strategy: Maintaining a constant dedicated capacity that can handle the steady stream of requests. This approach ensures reliable performance and avoids the complexities of frequent scaling adjustments.

This article highlights the origins and misconceptions surrounding Azure Functions cold starts. It then delves into the tools available for measuring cold starts and outlines various strategies for resolving them. It then presents several case studies exploring cold starts in real-world production settings. Finally, it extends the discussion to general scalability, offering insights tailored to the traffic patterns of various businesses.

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• Wenjing Zhou 4 ,
• Qixian Zhang 5 ,
• Jun Liu 2 ,
• Zhongdao Wu 1 ,
• Lan Guo 4 &

Parasites & Vectors volume  17 , Article number:  353 ( 2024 ) Cite this article

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Clonorchiasis has significant socioeconomic importance in endemic areas; however, studies investigating the disease burden in specific sub-regions are lacking. This study aims to address the gap by quantifying the current disease burden caused by clonorchiasis in Guangdong province and assessing its distribution characteristics.

Comprehensive measures, including prevalence rates, disability-adjusted life years (DALYs), and direct medical costs, were used to assess the disease burden of clonorchiasis. To estimate the prevalence rate, the number of infections was divided by the examined population, based on the annual surveillance data on clonorchiasis cases during 2016–2021. The calculation of DALYs was based on the epidemiological parameters according to the definition issued by the World Health Organization. Cost data of clonorchiasis were utilized to quantify the direct medical costs. The distribution characteristics of disease burden were assessed through comparisons of groups of population defined by geographic area, time, and characteristics of people.

In 2021, clonorchiasis posed a significant disease burden in Guangdong Province. The prevalence rate was found to be 4.25% [95% CI (4.02%, 4.49%)], with an associated burden of DALYs of 406,802.29 [95% CI (329,275.33, 49,215,163.78)] person-years. The per-case direct medical costs of patients with clonorchiasis were estimated to be CNY 7907.2 (SD = 5154.4). Notably, while the prevalence rate and DALYs showed a steady decrease from 2016 to 2020, there was a rising trend in 2021. Spatial clustering of clonorchiasis cases and DALYs was also observed, particularly along the Pearl River and Han River. This suggests a concentration of the disease in these regions. Furthermore, significant differences in prevalence rates were found among various demographic groups, including sex, age, occupation, and education level. Additionally, patients with longer hospital stays were more likely to incur higher direct medical costs.

Conclusions

The burden of clonorchiasis in Guangdong Province remains high, despite significant progress achieved through the implementation of the prevention and control programs. It is suggested that measures should be taken based on the distribution characteristics to maximize the effectiveness of prevention and control, with a primary focus on key populations and areas.

Graphical Abstract

Clonorchiasis, caused by Clonorchis sinensis , is a significant neglected tropical disease with features of low mortality and high disability [ 1 , 2 ]. This liver fluke infection is predominantly prevalent in areas with habits of eating raw fish and carries significant socioeconomic implications in endemic areas [ 3 , 4 ]. It has been estimated that the total economic burden of liver and biliary diseases caused by C. sinensis infection in Guangdong Province amounts to 1.6 billion Chinese yuan (CNY) [ 5 ]. This economic burden includes the direct economic burden of the disease, direct non-medical costs, and indirect economic burden, which cover expenditures from medical insurance, out-of-pocket payments, public funding, and other sources.

Clonorchiasis is a food-borne parasitic disease primarily transmitted through the ingestion of raw or undercooked freshwater fish that contain encysted metacercariae of C. sinensis [ 4 , 6 , 7 , 8 ]. Following infection, most of the individuals remain asymptomatic or experience mild symptoms, while some turn into substantial clinical or subclinical liver and biliary diseases, with cholangiocarcinoma (CCA) being the severe and fatal complication [ 9 ]. In 2009, C. sinensis was classified as a definite human carcinogenic (Group 1) by the International Agency for Research on Cancer (IARC) [ 10 , 11 ]. Currently, the main treatment for clonorchiasis is chemotherapy [ 12 ]. Considering the high economic burden caused by symptomatic therapy for sequelae, the prevention strategy, which includes preventive and curative measures, was proposed [ 13 , 14 ].

According to conservative estimation, approximately 15 million people worldwide have been infected with C. sinensis , with 85% of the cases attributed to China [ 15 ]. However, the degree of clonorchiasis endemicity in China varies across regions, with higher concentrations in the southeast and northeast [ 16 ]. Guangdong Province was found to be one of the most severely infected provinces according to the three large-scale nationwide surveys conducted in 1990, 2003, and 2015 [ 16 , 17 ]. The natural conditions, such as abundant river bodies and a climate suitable for the parasite, combined with the local dietary culture of eating raw fish, have contributed to the endemicity of clonorchiasis in Guangdong. The prevalence of the disease has been steadily increasing in Guangdong since 1990 [ 16 , 17 ]. In response, the Guangdong government issued the Prevention and Control Program for Key Parasitic Diseases (2016–2020) in 2016, implementing a series of prevention strategies were adopted [ 18 ]. It was assumed that high infection intensity and number of re-infections among hosts in endemic areas were associated with chronic infection, which might result in more severe health problems and produce a higher disease burden. Thus, it is of great importance to evaluate the current disease burden caused by clonorchiasis and investigate its temporal trends and distribution characteristics in Guangdong to facilitate the development of control strategies.

As defined by the World Health Organization (WHO), the disease burden was not only limited to incidence, mortality, and disability-adjusted life years (DALYs) [ 19 ] but also included the economic burden. Several studies have investigated the disease burden of clonorchiasis, among which most researchers followed the Global Burden of Disease (GBD) study and selected disability-adjusted life years as the measurement, and only one study evaluated the economic burden measured by currency. Furst et al. [ 20 ] found that the global disease burden caused by clonorchiasis in 2005 was approximately 275,370 DALYs, with China accounting for 84.1% (231,547 DALYs) and Vietnam, South Korea and Russia accounting for 15.9% (43,823 DALYs). Another study reported a higher figure with the DALYs owing to clonorchiasis were 489,174.04 person-years in China [ 21 ]. As for the economic burden, it was calculated that 1.3 billion CNY was created by C. sinensis infection in Guangdong [ 5 ]. Although research has been carried out on the estimation of the disease burden of clonorchiasis, only a few studies focused on endemic regions, and there was a lack of studies using comprehensive indicators.

Therefore, the primary objective of this study is to evaluate the current disease burden of clonorchiasis in Guangdong Province by utilizing synthesized indexes such as prevalence, DALYs, and cost of illness. Furthermore, the study aims to analyze the trends and distribution characteristics after the implementation of an integrated preventive strategy.

Study areas

Guangdong was one of the seven high clonorchiasis prevalence settings and was chosen to be the disease surveillance province [ 22 ]. Thus, an annual survey in fixed monitoring stations and mobile monitoring stations was carried out to investigate the current epidemic status of clonorchiasis from 2016 to 2021. The study included 16 fixed national surveillance sites, which were categorized according to their prevalence rate into low prevalence regions (≤ 10%), middle prevalence regions (> 10% and ≤ 30%), and high prevalence regions (> 30%). In each region, five villages or communities were selected from five different directions, including north, south, east, west, and middle. Subsequently, 200 villagers or citizens aged > 3 years were included in the survey from each unit. The study used a stratified random sampling method to select participants from each of the 16 fixed national surveillance sites. The sample size was determined based on the estimated prevalence rate of clonorchiasis in each region. The same sampling method was adopted for mobile surveillance sites.

Data collection

The prevalence survey data from 2016 to 2021 was collected from the Guangdong Provincial Center for Disease Control and Prevention, using methods such as reporting cases and active disease surveillance. The annual survey included fixed monitoring stations and mobile monitoring stations, which were used to collect data from the sampled individuals. Guangdong Province has established six national monitoring sites for liver fluke, two national comprehensive prevention and control demonstration areas, and eight provincial mobile monitoring sites. Among them, there are three fixed national monitoring sites, each with an annual budget of 45,000 CNY (6690.2 United States dollars, USD), totaling 135,000 CNY (20,070.5 USD); three mobile national monitoring sites, each with an annual budget of 50,000 CNY (7,433.5 USD), totaling 150,000 CNY (22,300.5 USD); two comprehensive prevention and control project counties, each with an annual budget of 150,000 CNY (22,300.5 USD), totaling 300,000 CNY (44,601.0 USD); and eight provincial monitoring sites, each with an annual budget of 50,000 CNY (7433.5 USD), totaling 400,000 CNY (59,468.1 USD). The total budget amounts to 985,000 CNY (146,440.1 USD). In addition, the study also utilized data from community health centers, hospitals, and clinics to ensure a comprehensive collection of prevalence data for clonorchiasis.

The sample size for the infection rate is specifically based on the 'Monitoring Plan for Clonorchiasis and Soil-Transmitted Helminthiases in Guangdong Province (Trial).' This study employed the modified Kato-Katz thick smear technique to examine and report egg counts. According to infection intensity classifications, > 98% of the infected individuals in the annual monitoring data had light infections (< 1000 eggs per gram of feces). The data included information on the number of examined persons, the number of persons infected with C. sinensis , and the general demographic information (e.g. age, sex, occupation, and education) of each examined individual. The crucial epidemiological disease parameters and demographic information, which were used to calculate DALYs, were obtained from literature and Guangdong Statistic Yearbooks or official documents. The cost data for treating clonorchiasis were acquired from a tertiary hospital in Guangdong Province, which was selected based on its reputation as a leading provider of healthcare services in the region. The hospital is known for its expertise in the treatment of infectious diseases, including clonorchiasis. While the hospital may not be representative of all healthcare facilities in Guangdong Province, it was chosen due to its status as a tertiary hospital and its extensive experience in treating clonorchiasis. The direct medical cost data were sourced from the medical information system of the hospital. Using International Classification of Diseases ten version (ICD-10) coding, the names of major diagnosed diseases between 2008 and 2022 (Clonorchiasis, Clonorchiasis (Chinese liver fluke disease), Clonorchiasis infection, parasitic infection, trematode infection, and Chinese liver fluke disease) were identified. Sociodemographic information (e.g. age, sex, ethnic and marital status), cost information, and healthcare utilization (length of stay) information of each case was included in the database.

A total of 124 patient medical records were selected for analysis. The costs were adjusted to 2022 CNY levels using the consumer price index, and extreme values ( n  = 114) were excluded before conducting the calculations. Considerations for the inclusion criteria of certain studies were as follows The C. sinensis infection group consisted of patients discharged with diagnoses of C. sinensis infection complicated by obstructive jaundice, cholecystitis, cholangitis, gallstones, cirrhosis, or malignant liver tumors. The non- C. sinensis infection group comprised patients discharged without diagnoses of C. sinensis infection but with complications such as obstructive jaundice, cholecystitis, cholangitis, gallstones, cirrhosis, or malignant liver tumors. Therefore, in this study, we considered the secondary disease burdens of obstructive jaundice, cholecystitis, cholangitis, gallstones, cirrhosis, and malignant liver tumors resulting from C. sinensis infection. Consequently, only patients with uncomplicated C. sinensis infections were included in the analysis for this study, excluding any cases with complications arising from the infection.

Data analysis

Calculation of dalys.

DALY is an index used to quantify health loss caused by a disease, and one DALY can be considered as one lost year of healthy life due to morbidity [ 22 , 23 , 24 , 25 ]. There are two methods for the calculation of DALY. One is based on incidence, and the other is based on prevalence [ 25 ]. DALY is calculated by adding years of life lost (YLLs) due to premature death from disease and years lived with disability (YLDs) owing to morbidity [ 25 ]. The formula was as follows:

In this study, the calculation of DALYs used a prevalence approach. YLDs were calculated by multiplying the number of the infected (number of population*prevalence rate of clonorchiasis) with corresponding disability weights (DW). The disability weights range from zero to one, and one represents the most severe health outcome of death. The specific calculation process is listed in formula (a).

The calculation of YLLs followed the method adopted by previous studies [ 20 , 21 ]. Premature death from C. sinensis was thought to be the attributable case of CCA. The odds ratio between C. sinensis infection and CCA and the incidence of CCA was used to compute the incidence rate of CCA, which was attributable to C. sinensis ( I *( OR -1)). Considering the poor prognosis and short disease duration of CCA [ 12 ], the mortality rate was replaced by its incidence rate. Finally, YLLs were calculated by the summation of all fatal populations multiplied by the life span at the age of death ( L e - L d ). The detailed procedure is expressed in formula (b).

The parameters used for evaluation were listed as follows. An estimation of the infection rate was obtained by dividing the number of infected by the number of examined persons. The provincial and municipal population was derived from the Guangdong Statistic Yearbooks [ 26 ]. The weighted disability weight due to C. sinensis in the Chinese population was 0.075 [95% confidential interval (95% CI): (0.060, 0.091)] [ 9 ]. The incidence rate of CCA among patients infected with C. sinensis was 1.5 per 100,000 population [ 27 ], and the odds ratio between C. sinensis and CCA was 4.47 [95% CI (2.61, 7.66)] [ 15 ]. The average life expectancy of the Guangdong population was 79.6 years old. As for the age of death in patients with CCA, it was replaced by the average age at the time of diagnosis. The figure used in the evaluation was 62.6 [95% CI (62.4, 62.8)] years old [ 28 ].

Calculation of cost of illness

The electronic medical records provided data for calculating direct medical costs from the healthcare system’s perspective. The direct calculation approach was used to evaluate the direct medical costs caused by clonorchiasis. In terms of composition regulated by the government, direct medical costs were made up of bed fees, diagnostic fees, treatment fees, and other fees. Considering the infection characteristics and high cure rate of clonorchiasis [ 29 ], the direct medical costs per case were calculated based on each record. Patients with re-infection were counted as multiple cases. Considering inflation, costs were adjusted to 2021 CNY value using the Consumer Price Index (CPI).

The prevalence rate of C. sinensis infection was calculated for each municipality in Guangdong Province, with the definition of positive infection being the presence of at least one egg. The 95% CI was calculated using a one-sample t-test. Comparisons of prevalence rates among people with different characteristics were achieved through the chi-square test. The significance level was set at 0.05. The main examined variables, DALYs and DALYs per 1000 population, were calculated by definition issued by WHO. The propagating imprecision approach was used to produce a 95% CI of DALYs [ 30 ]. The spatial distributions of DALYs and DALYs per 1000 population were demonstrated through maps, while the temporal trends were illustrated by line chart. As for cost data, descriptive statistics, including mean, standard deviation, median, percentiles, and proportion, were used to depict sociodemographic characteristics and direct medical costs. Due to the skewed distribution of medical costs, comparisons of costs for groups with different characteristics were made through the rank sum test (Mann-Whitney U test for two groups and Kruskal-Wallis H test for three and above groups). Statistical analyses were performed with Microsoft Excel 2019 ((Microsoft, Albuquerque, NM, USA) and R language (version 4.2.2). * P  < 0.05 is considered statistically significant.

A total of 129,582 people were examined to determine the infection level of C. sinensis in Guangdong Province from 2016 to 2021, with 10,270 in 2016, 17,332 in 2017, 21,577 in 2018, 22,879 in 2019, 28,880 in 2020, and 28,644 in 2021. The total number of infections was 4210, and the annual number of infections from 2016 to 2021 was 773, 856, 692, 417, 254, and 1218, respectively. The overall prevalence rate of clonorchiasis was 3.25% [95% CI 3.15%, 3.35%].

The infection rate of C. sinensis in Guangdong Province showed a decreasing trend between 2016 and 2020 and then staged a recovery in 2021. The infection rates from 2016 to 2021 were 7.53 [95% CI (7.02, 8.05)], 4.94 [95% CI (4.62, 5.27)], 3.21 [95% CI (2.98, 3.45)], 1.82 [95% CI (1.65, 2.00), 0.88 [95% CI (0.78, 0.99)], and 4.25 [95% CI (4.02, 4.49)], respectively (Table  1 ). The chi-square test indicated that the difference in infection rates in different years was remarkable ( χ 2  = 1511.1, P  < 0.001).

As for spatial distribution, C. sinensis infection appeared in area clustering in Guangdong Province, concentrating in the Pearl River and Han River basins. Of 21 prefecture-level cities, Jiangmen, Foshan, Zhongshan, and Heyuan had the highest infection rates. In 2021, the figures respectively reached 12.8%, 11.1%, 9.3%, and 37.2%. The prevalence situation was similar to that in other years (Table  1 ).

In terms of population distribution, people of different sex, age, occupation, and education showed significant differences in prevalence rates. Table 2 shows the infection rate of C. sinensis , which was stratified according to sex, age group, occupation, education, and years. Men had a significantly higher prevalence rate (4.27%) than women (2.26%) for infections with C. sinensis ( χ 2  = 413.3, P  < 0.001). People aged < 18 years old were less likely to have C. sinensis infection (0.54%) compared with individuals in other age groups ( χ 2  = 1860.1, P  < 0.001). With increase in age, the prevalence rose at the beginning but then it decreased, and the prevalence peak appeared in the 41–50-year-old group. Students had the lowest prevalence rate (0.69%) among all occupations ( χ 2  = 1041.0, P  < 0.001). The C. sinensis infection rate was the highest in people with a college degree (5.21%), followed by those with high school degrees (5.18%), illiteracy (4.63%), junior school degrees (3.36%), and elementary school education (1.80%). A significant difference was observed in people with different education levels ( χ 2  = 818.4, P  < 0.001).

The overall disease burden resulting from clonorchiasis in Guangdong was 406,802.29 [95% CI (329,275.33, 4,9215,163.78)] person-years in 2021, consisting of 402,390.00 [95% CI (324,984.35, 4,8761,687.27)] YLDs and 4,412.29 [95% CI (2,046.96, 847,007.02)] YLLs. The DALYs per 1000 population were 3.22 [95% CI (2.61, 389.85)] person-years. Among the 21 prefecture-level cities in Guangdong Province, Foshan, Heyuan, and Zhongshan showed the highest disease burden measured by DALYs (Table  3 ). The spatial distribution of DALYs caused by C. sinensis infection in each municipality across Guangdong is displayed in Fig. 1 .

Distribution of the disease burden of clonorchiasis in Guangdong Province in 2021. A DALY. B DALY per 1000 persons

From 2016 to 2021, the disease burden indicators, including DALYs and DALYs per 1000, gradually decreased at the beginning of 5 years and then rose suddenly (Fig.  2 ), consistent with the temporal trends of prevalence rate. However, the overall trends of DALYs and DALYs per 1000 presented a downward trend, decreasing from 618,862.85 and 5.70 in 2016 to 406,802.29 and 3.22 in 2021 (Table  4 ).

Temporal trends of DALYs of clonorchiasis in Guangdong Province

In total, 124 patients with the primary diagnosis of clonorchiasis were identified. After excluding extreme values, 114 patients were included for cost analysis. The basic characteristics are displayed in Table  5 . Out of the total cases, males accounted for 80.7%. The mean age was 44.9 ( SD  = 12.0) years old. Among all age groups, more cases were classified into the age group 40 to 60 years (47.4%), followed by the group < 40 years (37.7%) and > 60 years (14.9%). Of all the ethnic groups, the Han patients comprised the majority, with a proportion of 99.1%. As for marital status, 87.7% of patients were married. The average length of stay was 8.4 ( SD  = 4.4) days.

Overall, the direct medical costs of patients with clonorchiasis per case were CNY 7907.2 ( SD  = 5154.4) (equivalent to 1175.7 USD ± 766.3) (Table  6 ). Costs did not show significant differences among patients with different sex, age, ethnicity, and marital status, while the costs for patients having different lengths of stay were significantly different ( P  < 0.001).

In Guangdong, C. sinensis infections are highly prevalent, and the occurrence of repeated and chronic infection is common [ 13 , 31 , 32 ]. Notably, few studies have previously explored the disease burden of clonorchiasis in endemic areas using synthesized indexes. This study aimed to evaluate the disease burden caused by C. sinensis infection through comprehensive indicators and assess its trends from 2016 to 2021 in Guangdong.

It was found that the burden of disease associated with clonorchiasis in Guangdong was overwhelming, with a prevalence rate of 4.25%, DALYs of 406,802.29 [95% CI (329,275.33, 49,215,163.78)] person-years, and direct medical costs of CNY 7907.2 (USD 1175.7) in 2021. The prevalence rate, DALYs, and DALYs per 1000 population all experienced a downward trend between 2016 and 2020, then an upward trend in 2021, while in general, the situation in 2021 was better than in 2016. Moreover, the distribution of disease burden also showed spatial clustering, with infection cases concentrated in the Pearl River and Han River basins, such as Foshan, Zhongshan, and Heyuan. As for population distribution, people with different characteristics tend to have different prevalence rates and direct medical costs.

Based on the 2021 provincial clonorchiasis surveillance survey results, the prevalence rate of C. sinensis infection was 4.25% [95% CI (4.02, 4.49)]. The DALYs and DALYs per 1000 population due to clonorchiasis were 406,802.29 [95% CI (329,275.33, 49,215,163.78)] person-years and 3.22 [95% CI (2.61, 389.85)], respectively. Zhao et al. [ 20 ] found that the burden of clonorchiasis in Guangdong was 157,245.48 [95% CI (120,532.89, 199,807.40)] DALYs in 2015, and the global burden of clonorchiasis reported by Furst et al. [ 20 ] was 231,547 person-years. Compared with previous research, this study reported a much higher figure. The different computation methods and study time might explain the condition [ 21 ]. In the former study, a standardized prevalence rate was used for calculation, and thus the results might not accurately reflect the reality, while in the latter study, only severe disability due to infection was considered, which might lead to the result of lower disease burden. Different from these two studies, this research considered all severity levels of disability due to C. sinensis infection and adopted the latest raw prevalence rate for calculation. Therefore, to some extent, the results in this study could precisely reflect the current disease burden caused by clonorchiasis in Guangdong.

Through cost analysis of clonorchiasis, we found that the average direct medical costs per case in Guangdong were CNY 7,907.2 ( SD  = 5154.4) (equivalent to 1175.7 USD ± 766.3), lower than the previous research findings [ 5 ]. In that study, the calculated direct medical costs of clonorchiasis-induced gallbladder cholangitis, cholelithiasis, liver cirrhosis, and malignant liver tumor were respectively CNY 5015.52, CNY 9971.76, CNY 13,168.83, and CNY 17,638.28 in 2009 (CNY 7034.32, CNY 13,985.50, CNY 18,469.42, and CNY 24,737.87 in 2022) [ 33 ]. Different selection criteria for the study population might partly explain the situation. In this study, patients whose primary diagnosis was clonorchiasis were chosen, and the symptoms were relatively mild, while in that study, patients with liver and biliary disease were selected. Therefore, the costs in our study were relatively lower and closer to the real world’s true values.

From 2016 to 2021, the prevalence rate and DALYs of clonorchiasis decreased steadily first and then increased in 2021. The continued decline in the first 5 years might be attributed to the implementation of the Clonorchiasis Prevention and Control Project in Guangdong Province. Since 2016, the relevant departments have taken a series of measures such as propaganda and education, surveillance, and deworming treatment to prevent clonorchiasis [ 18 ]. Thus, the main source of contagion and transmission route were controlled, and the prevalence rate and DALYs decreased correspondingly. For the rise in 2021, one possible explanation was that, owing to the pandemic of COVID-19, there was a lack of human, physical, and financial resources. It was indicated that the shortage of resources was an obstacle to the prevention of clonorchiasis [ 34 ]. Therefore, the prevalence rate and DALYs showed a slight rebound in 2021.

The results revealed that the clonorchiasis cases were distributed in most areas of Guangdong Province, with the prevalence rate and DALYs primarily located alongside the Pearl River and Han River, consistent with the results of previous prevalence surveys conducted in Guangdong [ 35 , 36 , 37 ]. There were several reasons for the occurrence of spatial clustering. First, this might be partly due to the livable environments for C. sinensis [ 32 ]. Sufficient freshwater resources and suitable climate conditions in these regions make sure that different growth states of C. sinensis and the competence of infection exist, thus facilitating the spread of clonorchiasis. Second, this fluke develops in two intermediate hosts in fresh water and one definitive host, giving it a clear survival advantage [ 29 , 38 ]. In these settings, the existence of abundant intermediate hosts and definitive hosts laid good foundations for the formation of a relatively suitable food chain for predation and prey, thus making it possible for C. sinensis to develop a complete life history and resulting in clonorchiasis prevalence [ 3 ]. Moreover, studies showed that the well-developed fish breeding in these regions and the dietary habit of eating “sashimi” collaboratively promote the transmission of clonorchiasis [ 32 , 39 ]. In certain areas, poor management of human and animal feces results in their discharge into water sources, potentially containing eggs of C. sinensis , which can release miracidia and thus lead to the formation of an endemic disease [ 3 , 29 ]. Additionally, the high accessibility to infection sources was an important contributor that should not be ignored [ 3 ]. It was shown that habits such as catching fish without washing hands, holding fish with the mouth, and mixed use of the kitchen chopping boards could also increase the risk of infection.

This research, consistent with the previous study [ 17 ], found that the prevalence rate of clonorchiasis in males was significantly higher than that of females in Guangdong. Males have more chances to eat raw fish and are more indulged in this diet [ 40 ]. Although health education has been carried out for a long time, these dietary habits in men were hard to change [ 3 , 17 ]. Moreover, public officials, medical staff, and teachers had been reported to have higher infection rates among all occupations in this study, which further indicated the paradox between knowledge and behavior where the knowledge of clonorchiasis could not prevent people from consuming raw fish [ 32 ]. Additionally, the findings that the infection rate increased with age (0−50 years) and people aged between 40 to 60 years had the largest proportion of C. sinensis infection, in line with a previous study [ 3 ], indicated that the frequency of raw fish consumption was associated with clonorchiasis. As for education level, people with college degrees reported the highest rate. The confounding effect of age might explain the situation. The direct medical costs for patients with clonorchiasis significantly differed according to the length of stay. Generally, patients with severe clinical symptoms are more likely to have longer stays and higher direct medical costs. As previous findings showed, patients with different complications of C. sinensis infection had quite different costs [ 5 ].

This study quantified the current disease burden of clonorchiasis in Guangdong by using indexes of prevalence rate, DALYs, and direct medical costs and demonstrated its distribution characteristics and temporal trends. To the best of our knowledge, this was the first study having evaluated the disease burden of clonorchiasis in endemic areas from diverse dimensions and explained the sub-regional and temporal variation.

However, several limitations need to be acknowledged. First, due to the inaccessibility of data on clonorchiasis deaths in Guangdong, this study followed the approach of previous studies [ 12 , 21 ] and extracted the key parameters from the literature. The parameters used to calculate DALYs were the best available data we could find. Second, in the cost of illness study, because measurement of direct non-medical and indirect costs is not feasible with current data sources, only direct medical costs were included in this analysis. Thus, the economic burden reported in our analysis may be underestimated. It was recommended that the recording and archiving of relevant data should be strengthened in the future to provide more precise information.

Although effective measures have been taken to prevent and control clonorchiasis, the disease burden caused by clonorchiasis in Guangdong is still remarkable and showed a brief rebound in 2021. This situation highlights the urgent need for sustainable prevention and control strategies. Tailored preventive recommendations should be formulated based on an evidence-based scientific approach, considering the distribution characteristics of the disease burden. In endemic areas, it is crucial to prioritize efforts such as strengthening fish farming management, improving food safet,y and enhancing awareness, which plays a vital role in effectively combating clonorchiasis. It is important to pay particular attention to men, adults, and individuals with lower levels of education during the clonorchiasis prevention campaign.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

Chinese Yuan

Adding years of life lost

Consumer Price Index

World Health Organization

Global burden of disease

Aisability-adjusted life year

Confidence interval

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Acknowledgements

We would like to express our sincere gratitude to all the units and individuals who participated in the study of disease burden analysis and health economic evaluation of clonorchiasis. We also thank the Key Laboratory of Tropical Disease Control, Ministry of Education, Sun Yat-sen University, for their valuable assistance.

This work was supported by the Key Research and Development Program of Guangdong Province (no. 2022B1111030002), the National Key Research and Development Program of China (nos. 2021YFC2300800 and 2021YFC2300801), the National Natural Science Foundation of China (nos. 82272361, 81902081, 82202560, and 82161160343), the Natural Science Foundation of Guangdong Province (nos. 2024A1515010615 and 2021A1515010976), the Science and Technology Planning Project of Guangdong Province (no. 2021B1212040017), the Science and Technology Projects in Guangzhou (no. 2024A04J4314), the National Parasitic Resource Center of China (no. NPRC-2019–194-30), and the 111 Project (no. B12003). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Datao Lin, Zhuohui Deng and Zebin Chen contributed equally to this work.

Authors and Affiliations

Department of Parasitology, Key Laboratory of Tropical Disease Control (Ministry of Education), Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, China

Datao Lin, Kefeng Jiang, Zhongdao Wu & Xi Sun

Guangdong Provincial Center for Disease Control and Prevention, WHO Collaborating Centre for Surveillance, Research and Training of Emerging Infectious Diseases, Guangzhou, 511430, China

Zhuohui Deng, Qiming Zhang & Jun Liu

Center of Hepato-Pancreato-Biliary Surgery, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510080, China

Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-Sen University, Guangzhou, 510080, China

Wenjing Zhou & Lan Guo

Department of Gastroenterology, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510630, China

Qixian Zhang

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Contributions

ZDW, XS, ZHD, LG, and DTL conceived and designed the research. LG, DTL, and ZBC were responsible for drafted the manuscript. LG, DTL, ZBC, QMZ, and QXZ were responsible for study selection and data extraction. DTL, KFJ, WJZ, LG, ZHD, JL, and XS revised the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Zhuohui Deng , Lan Guo or Xi Sun .

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This study was approved by the Medical Ethics Committee of Sun Yat-sen University (2023–096).

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The authors declare no competing interests.

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Lin, D., Deng, Z., Chen, Z. et al. The disease burden and its distribution characteristics of clonorchiasis in Guangdong Province, Southern China. Parasites Vectors 17 , 353 (2024). https://doi.org/10.1186/s13071-024-06425-z

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Received : 18 April 2024

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DOI : https://doi.org/10.1186/s13071-024-06425-z

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