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Case Study vs. Survey: What's the Difference?

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Case Studies vs. Surveys

What's the difference.

Case studies and surveys are both research methods used in various fields to gather information and insights. However, they differ in their approach and purpose. Case studies involve in-depth analysis of a specific individual, group, or situation, aiming to understand the complexities and unique aspects of the subject. They provide detailed qualitative data and allow researchers to explore causal relationships. On the other hand, surveys involve collecting data from a larger sample size through standardized questionnaires or interviews. Surveys are more focused on obtaining quantitative data and generalizing findings to a larger population. While case studies offer rich and detailed information, surveys provide a broader perspective and statistical analysis. Ultimately, the choice between these methods depends on the research objectives and the nature of the research question.

Further Detail

Introduction.

When conducting research, it is essential to choose the most appropriate method to gather data and analyze information. Two commonly used research methods are case studies and surveys. Both methods have their own unique attributes and can provide valuable insights, but they differ in terms of their approach, data collection, and analysis techniques. In this article, we will explore the attributes of case studies and surveys, highlighting their strengths and limitations.

Case Studies

Case studies are an in-depth examination of a particular individual, group, or phenomenon. They involve a comprehensive analysis of a specific case, often using multiple sources of data such as interviews, observations, and documents. Case studies are particularly useful when researchers aim to understand complex social phenomena or explore rare events. They provide a detailed and holistic view of the subject under investigation.

One of the key attributes of case studies is their ability to generate rich and detailed qualitative data. By using various data collection methods, researchers can gather a wide range of information, including personal experiences, attitudes, and behaviors. This depth of data allows for a comprehensive understanding of the case, capturing nuances and complexities that may not be captured by other research methods.

Furthermore, case studies are often conducted in real-world settings, providing a high level of ecological validity. Researchers can observe and analyze the subject within its natural context, which enhances the external validity of the findings. This attribute is particularly valuable when studying complex social phenomena that are influenced by contextual factors.

However, case studies also have limitations. Due to their in-depth nature, case studies are time-consuming and resource-intensive. They require significant effort to collect and analyze data, making them less suitable for large-scale studies. Additionally, the findings of case studies may lack generalizability, as they are often focused on specific cases or contexts. Therefore, caution must be exercised when applying the results of a case study to a broader population.

Surveys, on the other hand, are a research method that involves collecting data from a large number of participants using standardized questionnaires or interviews. Surveys are widely used in social sciences and market research to gather quantitative data and identify patterns or trends within a population. They provide a snapshot of the opinions, attitudes, and behaviors of a specific group.

One of the primary attributes of surveys is their ability to collect data from a large and diverse sample. By reaching a significant number of participants, surveys allow researchers to generalize their findings to a broader population. This attribute makes surveys particularly useful when studying large-scale phenomena or when the goal is to make statistical inferences.

Moreover, surveys offer a structured and standardized approach to data collection. The use of pre-determined questions and response options ensures consistency across participants, making it easier to compare and analyze the data. Surveys also allow for efficient data collection, as they can be administered to a large number of participants simultaneously, reducing the time and resources required.

However, surveys also have limitations. They rely heavily on self-reporting, which may introduce response biases or inaccuracies. Participants may provide socially desirable responses or misunderstand the questions, leading to biased or unreliable data. Additionally, surveys often provide limited depth of information, as they focus on collecting quantitative data rather than exploring the underlying reasons or motivations behind participants' responses.

Comparing Case Studies and Surveys

While case studies and surveys differ in their approach and data collection techniques, they both have their own strengths and limitations. Case studies offer a detailed and holistic understanding of a specific case or phenomenon, capturing rich qualitative data and providing high ecological validity. However, they are time-consuming, resource-intensive, and may lack generalizability.

On the other hand, surveys allow for data collection from a large and diverse sample, enabling generalizability and statistical inferences. They offer a structured and efficient approach to data collection, but may suffer from response biases and provide limited depth of information.

Choosing between case studies and surveys depends on the research objectives, the nature of the phenomenon under investigation, and the available resources. If the goal is to explore complex social phenomena in-depth and within their natural context, a case study may be the most appropriate method. However, if the aim is to gather data from a large population and make statistical inferences, a survey would be more suitable.

It is worth noting that case studies and surveys are not mutually exclusive. In fact, they can complement each other in a mixed-methods approach. Researchers can use a case study to gain a deep understanding of a specific case and then conduct a survey to validate or generalize the findings to a larger population.

Case studies and surveys are valuable research methods that offer unique attributes and insights. Case studies provide a detailed and holistic understanding of a specific case or phenomenon, capturing rich qualitative data and enhancing external validity. Surveys, on the other hand, allow for data collection from a large and diverse sample, enabling generalizability and statistical inferences. Both methods have their own strengths and limitations, and the choice between them depends on the research objectives and available resources. By understanding the attributes of case studies and surveys, researchers can make informed decisions and conduct rigorous and impactful research.

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distinguish between a case study and a survey

Distinguishing Between Case Study & Survey Methods

Maria Nguyen

Key Difference – Case Study vs Survey

When carrying out research, case studies and surveys are two methods used by researchers. Although both are used to collect information, there is a key difference between a case study and a survey. A case study involves researching an individual, group, or specific situation in-depth, usually over a long period of time. On the other hand, a survey involves gathering data from an entire population or a very large sample to understand opinions on a specific topic. The main difference between the two methods is that case studies produce rich, descriptive data, while surveys do not; instead, the data collected from surveys is more statistically significant.

Key Takeaways

  • Case studies involve in-depth research of an individual, group, or specific situation, while surveys gather data from an entire population or a large sample.
  • Case studies produce rich, descriptive data, while surveys produce data that is more statistically significant.
  • Case studies are used in qualitative research, while surveys are mostly used in quantitative research.

What is a Case Study?

A case study refers to an in-depth study in which an individual, group, or a particular situation is studied. This is used in both natural and social sciences. In the natural sciences, a case study can be used to validate a theory or even a hypothesis. In the social sciences, case studies are used extensively to study human behavior and comprehend various social aspects. For example, in psychology, case studies are conducted to comprehend individual behavior. In such cases, the researcher records the entire history of the individual so that it enables him to identify various patterns of behavior. One of the classic examples of a case study is Sigmund Freud’s study of Anna O.

Case studies typically produce rich descriptive data. However, they cannot be used to provide generalizations on an entire population since the sample of a case study is usually limited to a single individual or a few individuals. Various research techniques, such as interviews, direct and participatory observation, and documents can be used for case studies.

What is a Survey?

A survey refers to research where data is gathered from an entire population or a very large sample to understand the opinions on a particular matter. In modern society, surveys are often used in politics and marketing. For example, imagine a situation where an organization wishes to understand the opinions of consumers on their latest product. Naturally, the organization would conduct a survey to comprehend the opinions of the consumer.

One of the most powerful research techniques used for surveys is the questionnaire. For this, the researcher creates a set of questions on the topic for which he will gather information from the participants. Unlike case studies, the data gathered from surveys is not very descriptive. Instead, they are statistically significant.

What is the difference between Case Study and Survey?

Definitions of Case Study and Survey: Case Study: A case study refers to an in-depth study in which an individual, group, or a particular situation is studied. Survey: A survey refers to research where data is gathered from an entire population or a very large sample to understand the opinions on a particular matter. Characteristics of Case Study and Survey: Research Type: Case Study: Case studies are used in qualitative research. Survey: Surveys are mostly used in quantitative research. Data: Case Study: Case studies produce rich in-depth data. Survey: Surveys produce numerical data. Sample: Case Study: For a case study, a relatively small population is chosen. This can vary from a few individuals to groups. Survey: For a survey, a large population can be used as the sample.

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Case Study vs. Survey — What's the Difference?

distinguish between a case study and a survey

Difference Between Case Study and Survey

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Guilherme Mazui

  • What is the Difference Between Case Study and Survey?

The main difference between a case study and a survey lies in the scope and type of data collected. Here are the key differences between the two research methods:

Case Study :

  • Focuses on an in-depth examination of a specific individual, group, or situation.
  • Uses qualitative data, often collected through interviews, observations, and document analysis.
  • Aims to understand the complexities of the subject matter, explore its context and environment, and highlight the unique aspects of the situation.
  • Provides rich, descriptive data.
  • Has a relatively long duration.
  • Involves collecting and analyzing data from a sample of respondents, typically representing a larger population.
  • Uses quantitative data, often collected through questionnaires or interviews with structured questions.
  • Aims to gather information on a larger population by selecting a representative sample.
  • Provides statistically significant data.
  • Can be conducted with a larger sample size, making it more generalizable.

In summary, a case study focuses on a specific subject or situation and collects qualitative data to provide a detailed understanding of that subject, while a survey study gathers data from a larger sample and uses quantitative methods to analyze the data and find patterns or relationships.

Comparative Table: Case Study vs Survey

Here is a table comparing the differences between a case study and a survey:

In summary, case studies and surveys are both research methods, but they differ in their purpose, approach, sample size, data collection, data analysis, and limitations. Case studies are more qualitative and in-depth, focusing on a specific case or cases, while surveys are more quantitative and widespread, gathering data from a larger population.

  • Questionnaire vs Survey
  • Case Study vs Research
  • Census Survey vs Sample Survey
  • Survey vs Experiment
  • Census vs Survey
  • Case Study vs Scientific Research
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  • Case Study vs Case History
  • Case Study vs Descriptive Approach to Research
  • Case Study vs Solved Case Study
  • Case Study vs Ethnography
  • Case Study vs Phenomenology
  • Cohort vs Case-Control Study
  • Census vs Sampling
  • Study vs Experiment
  • Cohort vs Panel Study
  • Longitudinal vs Cross-Sectional Study
  • Market Research vs Marketing Research

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Distinguishing case study as a research method from case reports as a publication type

Kristine m alpi , mls, mph, phd, ahip, john jamal evans , phd.

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Received 2018 Oct 1; Accepted 2018 Oct 1; Issue date 2019 Jan.

Articles in this journal are licensed under a Creative Commons Attribution 4.0 International License .

The purpose of this editorial is to distinguish between case reports and case studies. In health, case reports are familiar ways of sharing events or efforts of intervening with single patients with previously unreported features. As a qualitative methodology, case study research encompasses a great deal more complexity than a typical case report and often incorporates multiple streams of data combined in creative ways. The depth and richness of case study description helps readers understand the case and whether findings might be applicable beyond that setting.

Single-institution descriptive reports of library activities are often labeled by their authors as “case studies.” By contrast, in health care, single patient retrospective descriptions are published as “case reports.” Both case reports and case studies are valuable to readers and provide a publication opportunity for authors. A previous editorial by Akers and Amos about improving case studies addresses issues that are more common to case reports; for example, not having a review of the literature or being anecdotal, not generalizable, and prone to various types of bias such as positive outcome bias [ 1 ]. However, case study research as a qualitative methodology is pursued for different purposes than generalizability. The authors’ purpose in this editorial is to clearly distinguish between case reports and case studies. We believe that this will assist authors in describing and designating the methodological approach of their publications and help readers appreciate the rigor of well-executed case study research.

Case reports often provide a first exploration of a phenomenon or an opportunity for a first publication by a trainee in the health professions. In health care, case reports are familiar ways of sharing events or efforts of intervening with single patients with previously unreported features. Another type of study categorized as a case report is an “N of 1” study or single-subject clinical trial, which considers an individual patient as the sole unit of observation in a study investigating the efficacy or side effect profiles of different interventions. Entire journals have evolved to publish case reports, which often rely on template structures with limited contextualization or discussion of previous cases. Examples that are indexed in MEDLINE include the American Journal of Case Reports , BMJ Case Reports, Journal of Medical Case Reports, and Journal of Radiology Case Reports . Similar publications appear in veterinary medicine and are indexed in CAB Abstracts, such as Case Reports in Veterinary Medicine and Veterinary Record Case Reports .

As a qualitative methodology, however, case study research encompasses a great deal more complexity than a typical case report and often incorporates multiple streams of data combined in creative ways. Distinctions include the investigator’s definitions and delimitations of the case being studied, the clarity of the role of the investigator, the rigor of gathering and combining evidence about the case, and the contextualization of the findings. Delimitation is a term from qualitative research about setting boundaries to scope the research in a useful way rather than describing the narrow scope as a limitation, as often appears in a discussion section. The depth and richness of description helps readers understand the situation and whether findings from the case are applicable to their settings.

CASE STUDY AS A RESEARCH METHODOLOGY

Case study as a qualitative methodology is an exploration of a time- and space-bound phenomenon. As qualitative research, case studies require much more from their authors who are acting as instruments within the inquiry process. In the case study methodology, a variety of methodological approaches may be employed to explain the complexity of the problem being studied [ 2 , 3 ].

Leading authors diverge in their definitions of case study, but a qualitative research text introduces case study as follows:

Case study research is defined as a qualitative approach in which the investigator explores a real-life, contemporary bounded system (a case) or multiple bound systems (cases) over time, through detailed, in-depth data collection involving multiple sources of information, and reports a case description and case themes. The unit of analysis in the case study might be multiple cases (a multisite study) or a single case (a within-site case study). [ 4 ]

Methodologists writing core texts on case study research include Yin [ 5 ], Stake [ 6 ], and Merriam [ 7 ]. The approaches of these three methodologists have been compared by Yazan, who focused on six areas of methodology: epistemology (beliefs about ways of knowing), definition of cases, design of case studies, and gathering, analysis, and validation of data [ 8 ]. For Yin, case study is a method of empirical inquiry appropriate to determining the “how and why” of phenomena and contributes to understanding phenomena in a holistic and real-life context [ 5 ]. Stake defines a case study as a “well-bounded, specific, complex, and functioning thing” [ 6 ], while Merriam views “the case as a thing, a single entity, a unit around which there are boundaries” [ 7 ].

Case studies are ways to explain, describe, or explore phenomena. Comments from a quantitative perspective about case studies lacking rigor and generalizability fail to consider the purpose of the case study and how what is learned from a case study is put into practice. Rigor in case studies comes from the research design and its components, which Yin outlines as (a) the study’s questions, (b) the study’s propositions, (c) the unit of analysis, (d) the logic linking the data to propositions, and (e) the criteria for interpreting the findings [ 5 ]. Case studies should also provide multiple sources of data, a case study database, and a clear chain of evidence among the questions asked, the data collected, and the conclusions drawn [ 5 ].

Sources of evidence for case studies include interviews, documentation, archival records, direct observations, participant-observation, and physical artifacts. One of the most important sources for data in qualitative case study research is the interview [ 2 , 3 ]. In addition to interviews, documents and archival records can be gathered to corroborate and enhance the findings of the study. To understand the phenomenon or the conditions that created it, direct observations can serve as another source of evidence and can be conducted throughout the study. These can include the use of formal and informal protocols as a participant inside the case or an external or passive observer outside of the case [ 5 ]. Lastly, physical artifacts can be observed and collected as a form of evidence. With these multiple potential sources of evidence, the study methodology includes gathering data, sense-making, and triangulating multiple streams of data. Figure 1 shows an example in which data used for the case started with a pilot study to provide additional context to guide more in-depth data collection and analysis with participants.

Figure 1

Key sources of data for a sample case study

VARIATIONS ON CASE STUDY METHODOLOGY

Case study methodology is evolving and regularly reinterpreted. Comparative or multiple case studies are used as a tool for synthesizing information across time and space to research the impact of policy and practice in various fields of social research [ 9 ]. Because case study research is in-depth and intensive, there have been efforts to simplify the method or select useful components of cases for focused analysis. Micro-case study is a term that is occasionally used to describe research on micro-level cases [ 10 ]. These are cases that occur in a brief time frame, occur in a confined setting, and are simple and straightforward in nature. A micro-level case describes a clear problem of interest. Reporting is very brief and about specific points. The lack of complexity in the case description makes obvious the “lesson” that is inherent in the case; although no definitive “solution” is necessarily forthcoming, making the case useful for discussion. A micro-case write-up can be distinguished from a case report by its focus on briefly reporting specific features of a case or cases to analyze or learn from those features.

DATABASE INDEXING OF CASE REPORTS AND CASE STUDIES

Disciplines such as education, psychology, sociology, political science, and social work regularly publish rich case studies that are relevant to particular areas of health librarianship. Case reports and case studies have been defined as publication types or subject terms by several databases that are relevant to librarian authors: MEDLINE, PsycINFO, CINAHL, and ERIC. Library, Information Science & Technology Abstracts (LISTA) does not have a subject term or publication type related to cases, despite many being included in the database. Whereas “Case Reports” are the main term used by MEDLINE’s Medical Subject Headings (MeSH) and PsycINFO’s thesaurus, CINAHL and ERIC use “Case Studies.”

Case reports in MEDLINE and PsycINFO focus on clinical case documentation. In MeSH, “Case Reports” as a publication type is specific to “clinical presentations that may be followed by evaluative studies that eventually lead to a diagnosis” [ 11 ]. “Case Histories,” “Case Studies,” and “Case Study” are all entry terms mapping to “Case Reports”; however, guidance to indexers suggests that “Case Reports” should not be applied to institutional case reports and refers to the heading “Organizational Case Studies,” which is defined as “descriptions and evaluations of specific health care organizations” [ 12 ].

PsycINFO’s subject term “Case Report” is “used in records discussing issues involved in the process of conducting exploratory studies of single or multiple clinical cases.” The Methodology index offers clinical and non-clinical entries. “Clinical Case Study” is defined as “case reports that include disorder, diagnosis, and clinical treatment for individuals with mental or medical illnesses,” whereas “Non-clinical Case Study” is a “document consisting of non-clinical or organizational case examples of the concepts being researched or studied. The setting is always non-clinical and does not include treatment-related environments” [ 13 ].

Both CINAHL and ERIC acknowledge the depth of analysis in case study methodology. The CINAHL scope note for the thesaurus term “Case Studies” distinguishes between the document and the methodology, though both use the same term: “a review of a particular condition, disease, or administrative problem. Also, a research method that involves an in-depth analysis of an individual, group, institution, or other social unit. For material that contains a case study, search for document type: case study.” The ERIC scope note for the thesaurus term “Case Studies” is simple: “detailed analyses, usually focusing on a particular problem of an individual, group, or organization” [ 14 ].

PUBLICATION OF CASE STUDY RESEARCH IN LIBRARIANSHIP

We call your attention to a few examples published as case studies in health sciences librarianship to consider how their characteristics fit with the preceding definitions of case reports or case study research. All present some characteristics of case study research, but their treatment of the research questions, richness of description, and analytic strategies vary in depth and, therefore, diverge at some level from the qualitative case study research approach. This divergence, particularly in richness of description and analysis, may have been constrained by the publication requirements.

As one example, a case study by Janke and Rush documented a time- and context-bound collaboration involving a librarian and a nursing faculty member [ 15 ]. Three objectives were stated: (1) describing their experience of working together on an interprofessional research team, (2) evaluating the value of the librarian role from librarian and faculty member perspectives, and (3) relating findings to existing literature. Elements that signal the qualitative nature of this case study are that the authors were the research participants and their use of the term “evaluation” is reflection on their experience. This reads like a case study that could have been enriched by including other types of data gathered from others engaging with this team to broaden the understanding of the collaboration.

As another example, the description of the academic context is one of the most salient components of the case study written by Clairoux et al., which had the objectives of (1) describing the library instruction offered and learning assessments used at a single health sciences library and (2) discussing the positive outcomes of instruction in that setting [ 16 ]. The authors focus on sharing what the institution has done more than explaining why this institution is an exemplar to explore a focused question or understand the phenomenon of library instruction. However, like a case study, the analysis brings together several streams of data including course attendance, online material page views, and some discussion of results from surveys. This paper reads somewhat in between an institutional case report and a case study.

The final example is a single author reporting on a personal experience of creating and executing the role of research informationist for a National Institutes of Health (NIH)–funded research team [ 17 ]. There is a thoughtful review of the informationist literature and detailed descriptions of the institutional context and the process of gaining access to and participating in the new role. However, the motivating question in the abstract does not seem to be fully addressed through analysis from either the reflective perspective of the author as the research participant or consideration of other streams of data from those involved in the informationist experience. The publication reads more like a case report about this informationist’s experience than a case study that explores the research informationist experience through the selection of this case.

All of these publications are well written and useful for their intended audiences, but in general, they are much shorter and much less rich in depth than case studies published in social sciences research. It may be that the authors have been constrained by word counts or page limits. For example, the submission category for Case Studies in the Journal of the Medical Library Association (JMLA) limited them to 3,000 words and defined them as “articles describing the process of developing, implementing, and evaluating a new service, program, or initiative, typically in a single institution or through a single collaborative effort” [ 18 ]. This definition’s focus on novelty and description sounds much more like the definition of case report than the in-depth, detailed investigation of a time- and space-bound problem that is often examined through case study research.

Problem-focused or question-driven case study research would benefit from the space provided for Original Investigations that employ any type of quantitative or qualitative method of analysis. One of the best examples in the JMLA of an in-depth multiple case study that was authored by a librarian who published the findings from her doctoral dissertation represented all the elements of a case study. In eight pages, she provided a theoretical basis for the research question, a pilot study, and a multiple case design, including integrated data from interviews and focus groups [ 19 ].

We have distinguished between case reports and case studies primarily to assist librarians who are new to research and critical appraisal of case study methodology to recognize the features that authors use to describe and designate the methodological approaches of their publications. For researchers who are new to case research methodology and are interested in learning more, Hancock and Algozzine provide a guide [ 20 ].

We hope that JMLA readers appreciate the rigor of well-executed case study research. We believe that distinguishing between descriptive case reports and analytic case studies in the journal’s submission categories will allow the depth of case study methodology to increase. We also hope that authors feel encouraged to pursue submitting relevant case studies or case reports for future publication.

Editor’s note: In response to this invited editorial, the Journal of the Medical Library Association will consider manuscripts employing rigorous qualitative case study methodology to be Original Investigations (fewer than 5,000 words), whereas manuscripts describing the process of developing, implementing, and assessing a new service, program, or initiative—typically in a single institution or through a single collaborative effort—will be considered to be Case Reports (formerly known as Case Studies; fewer than 3,000 words).

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  1. Case Study vs. Survey - What's the Difference? | This vs. That

    Case studies and surveys are both valuable research methods, each with its own strengths and limitations. Case studies offer in-depth insights into specific cases, providing rich and detailed data. They are particularly useful for exploring complex and unique phenomena.

  2. Case Study vs. Survey: What’s the Difference?

    Key Differences. A case study involves a detailed examination of a single subject, such as an individual, event, or organization, to gain in-depth insights. In contrast, a survey is a research tool used to gather data from a sample population, focusing on gathering quantitative information or opinions through questions. 14.

  3. Case Studies vs. Surveys - What's the Difference? - This vs. That

    Choosing between case studies and surveys depends on the research objectives, the nature of the phenomenon under investigation, and the available resources. If the goal is to explore complex social phenomena in-depth and within their natural context, a case study may be the most appropriate method.

  4. Comparing Case Study vs. Survey Research: Which Method is ...

    In this blog, we will explore the key differences between case study research and survey research, their unique benefits, and how to determine which method is best suited for your study.

  5. Distinguishing Between Case Study & Survey Methods

    The difference between a case study and a survey lies in their research methods, with case studies focusing on in-depth analysis of a specific subject or situation, while surveys involve collection and analysis of data from a larger population. Learn the difference here.

  6. Case Study vs. Survey — What’s the Difference?

    A case study is an in-depth analysis of a specific individual, group, or event, while a survey is a method of gathering information from a large number of respondents.

  7. What is the Difference Between Case Study and Survey?

    In summary, a case study focuses on a specific subject or situation and collects qualitative data to provide a detailed understanding of that subject, while a survey study gathers data from a larger sample and uses quantitative methods to analyze the data and find patterns or relationships.

  8. What Is a Case Study? | Definition, Examples & Methods - Scribbr

    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.

  9. Distinguishing case study as a research method from case ...

    We have distinguished between case reports and case studies primarily to assist librarians who are new to research and critical appraisal of case study methodology to recognize the features that authors use to describe and designate the methodological approaches of their publications.

  10. What is a Case Study? - SAGE Publications Ltd

    What is a Case Study? In this chapter we distinguish between extensive and intensive research in social science (section 1.1). The object of case studies – a social phenomenon – is dis-cussed in section 1.2. After surveying some historical origins of the case study in