How Do You Define Case Boundaries by Person, Organization, Place, Event, or Time?

Where Does Your Case Begin, and Where Does It End?

Suppose you want to investigate how a university developed its generative AI assessment policy. You plan to interview faculty members, examine institutional documents, and reconstruct the decisions that led to implementation.

But which activities belong to the case? Should the investigation include discussions that occurred before the policy was formally proposed? What about national regulations that influenced the university? Are external consultants part of the case? Does the case end when the policy is approved or when its implementation is evaluated?

These are questions about case boundaries. They determine what the researcher is investigating, which evidence is relevant, and what the resulting findings can legitimately explain.

A case study without sufficiently clear boundaries risks becoming an expanding collection of interesting observations rather than a coherent investigation of a defined phenomenon.

Define Boundaries According to the Case, Research Question, and Analytical Purpose

How to Establish Meaningful Boundaries Around a Case

What Does It Mean to Bound a Case?

Bounding a case means specifying the limits of the entity, process, event, or system that the research seeks to understand.

Case study scholars commonly emphasize the importance of identifying a bounded system or a clearly defined case. Merriam and Tisdell's qualitative case study tradition places particular emphasis on boundedness, while Yin's approach requires clarity about the case, its context, and the unit of analysis.

Boundaries help researchers decide which evidence is relevant and which claims fall within the scope of the inquiry.

For example, a study of a university's AI assessment policy might focus on the institutional process through which the policy was developed, approved, and implemented during a specified period.

The researcher would not necessarily investigate every aspect of university governance, every use of AI by students, or every national debate about artificial intelligence.

Those matters may provide contextual information, but they do not automatically become part of the case.

Why Must the Unit of Analysis Be Identified Before Setting Boundaries?

The unit of analysis determines what the researcher intends to understand or explain. Boundaries determine the limits of that object of inquiry.

Suppose a study investigates how one school introduced a digital learning platform. The unit of analysis might be the school-level implementation process rather than the school as an entire organization.

That distinction matters because the researcher may need to examine implementation decisions, teacher training, technical support, and classroom practices without investigating unrelated school activities.

Alternatively, if the research question concerns the school as an organizational system, a broader institutional boundary may be appropriate.

Researchers should therefore establish the unit of analysis in the case study before determining the precise scope of evidence collection.

When the unit of analysis is unclear, boundaries often become arbitrary or are defined retrospectively by whichever information happens to be available.

How Do You Define a Case by Person?

A person can constitute a case when the research investigates that individual's bounded experiences, decisions, practices, or development as a coherent object of inquiry.

For example, a researcher might examine how one teacher developed an AI-supported assessment practice over two academic years.

The person is the central case, but the investigation still requires boundaries. The researcher might focus on the teacher's professional practice within a particular school and period rather than every aspect of the person's life.

Relevant evidence could include interviews, classroom observations, assessment materials, reflective journals, and institutional documents.

Family circumstances or earlier professional experiences may be included when they are analytically relevant, but their inclusion should be justified.

Importantly, interviewing one person does not automatically create a case study. The research must investigate the person as a bounded case rather than merely collect one participant's response to a general question.

How Do You Define a Case by Organization?

An organization may constitute a case when its structures, practices, relationships, or development are central to the research question.

Examples include a school, university, research institute, hospital, government agency, or educational technology organization.

However, defining an organization as a case does not mean studying everything within it.

Suppose the research examines how a university coordinates AI governance across academic and administrative units.

The institutional boundary may include its formal governance bodies, faculties, administrative offices, and relevant internal procedures.

External regulators and technology providers may influence the case without being organizational members. Their actions may still need to be examined as contextual influences.

Researchers should distinguish formal organizational membership from analytical relevance. An external actor can provide important evidence about the case without becoming part of the organizational unit being studied.

How Do You Define a Case by Place?

Spatial boundaries identify the geographical or physical setting relevant to the case.

A case might concern a rural school community, a particular campus, a municipality, or an educational program operating within a defined geographical area.

For example, researchers could investigate how a remote island community organized digital learning during prolonged connectivity disruptions.

The geographical boundary may be meaningful because infrastructure, transportation, community relationships, and local governance influence educational provision.

However, geographical boundaries should not be treated as self-explanatory. Researchers must explain why the selected place constitutes a coherent case rather than simply a convenient research location.

Digital and hybrid activities also complicate spatial boundaries. A university's online learning community may involve students and instructors located outside its physical campus.

In such settings, participation rules, institutional relationships, and digital environments may provide more meaningful boundaries than physical location alone.

How Do You Define a Case by Event?

An event can constitute a case when the investigation centers on a distinguishable occurrence and its relevant development, participants, decisions, and consequences.

Examples include the introduction of a curriculum reform, an institutional response to a cybersecurity incident, a university accreditation process, or a dispute over the use of AI-generated academic work.

Suppose a university experienced a major examination integrity incident involving generative AI.

The case might include the incident's discovery, institutional investigation, decision-making process, and immediate policy response.

The researcher should determine whether earlier institutional conditions and later consequences belong within the case or serve as contextual evidence.

An event-based case is not necessarily restricted to the day on which the event occurred. Its analytically meaningful boundaries may extend across preparation, occurrence, response, and aftermath.

How Do You Define a Case by Time?

Temporal boundaries establish the period within which the case is investigated.

For example, a study might examine the first academic year of a university's AI assessment policy implementation.

The start date could be the official policy approval, the first faculty consultation, or the beginning of operational implementation, depending on the research question.

The end date might correspond to the completion of the first implementation cycle or a formal institutional review.

Researchers should avoid choosing dates solely because the available dataset begins or ends there.

Administrative calendars can be convenient, but they do not necessarily correspond to the meaningful beginning and end of the phenomenon.

Where historical developments are essential, the researcher may examine earlier events as contextual evidence without expanding the principal case period indefinitely.

Can a Case Have Several Boundaries at Once?

Yes. Most substantive case studies involve several overlapping boundaries.

Consider a study of an AI-supported assessment initiative introduced by one university during two academic years.

These dimensions are not competing definitions. Together, they establish a more precise case.

However, adding boundaries should improve conceptual clarity rather than produce an unnecessarily restrictive definition that excludes essential processes.

How Are Case Boundaries Different From Participant Sampling Criteria?

Case boundaries define what belongs to the case. Participant sampling criteria determine which individuals will provide information about it.

Suppose the case is a university's AI policy-development process. The researcher might recruit administrators, faculty representatives, and students who participated in consultation activities.

These recruitment criteria do not necessarily define the boundaries of the case itself.

A faculty member who was not interviewed may still have contributed to the policy process. An external consultant may provide valuable information despite not belonging to the institution.

Similarly, selecting ten interview participants does not mean the case contains only ten people.

Researchers should distinguish case selection, participant recruitment, and evidence selection because each serves a different methodological purpose.

How Should Researchers Handle Context Outside the Case?

Contextual influences often extend beyond the case boundaries.

For example, national education regulations may influence a university's AI governance decisions, even though the national regulatory system is not itself the case.

The researcher may examine relevant regulations and interview external experts to understand how those influences shaped institutional decisions.

Including such evidence does not necessarily expand the unit of analysis to the entire national education system.

The distinction is between investigating an external influence as part of the case's context and treating that external system as an additional case.

This distinction is especially important when the phenomenon and context interact closely, as emphasized in Yin's approach to case study research.

What If Case Boundaries Are Unclear or Change During the Study?

Some cases involve evolving processes whose boundaries cannot be specified perfectly at the outset.

For example, an institutional AI policy initiative may initially concern assessment but later expand into research integrity and student support.

Researchers may need to refine their boundaries as they understand how the initiative developed.

Such refinement can be defensible in qualitative inquiry, provided it follows a coherent analytical rationale and is documented transparently.

However, changing boundaries solely to include favorable evidence or exclude contradictory observations can undermine credibility.

Researchers should maintain a record of boundary decisions, their justifications, and their implications for sampling and interpretation.

When Do Boundaries Become Too Narrow?

Boundaries may be too narrow when they exclude processes or relationships necessary to answer the research question.

For example, studying only the month in which a university approved an AI policy may be insufficient if the research question concerns how faculty consultation shaped the final decision over several semesters.

Similarly, examining only formal administrators may provide an incomplete account if informal faculty networks played a substantial role in implementation.

The researcher should determine whether excluded information is merely contextual or essential to explaining the phenomenon.

When essential evidence lies outside the proposed boundaries, the case definition may require revision.

When Do Boundaries Become Too Broad?

Boundaries become too broad when the investigation includes so many institutions, processes, or periods that the case loses coherence.

For example, a proposed study of "AI in Philippine higher education from its introduction to the present" may encompass many distinct policies, institutions, technologies, and experiences.

Without a more precise case definition, the study may become a broad descriptive review rather than an intensive investigation of a bounded case.

Researchers should identify which specific system, process, or event is analytically central.

A narrower case is not necessarily less valuable. It may provide the depth required to develop a credible explanation.

How Should Case Boundaries Be Reported in the Methods Section?

A defensible methods section should identify the case, explain why it was selected, and specify its relevant boundaries.

The researcher should describe the organizational or geographical setting, the phenomenon under investigation, the temporal period, and any important inclusion or exclusion decisions.

Where the case contains embedded units, their relationship to the overarching case should also be explained.

Boundary decisions should be linked to the research question rather than presented as arbitrary administrative limits.

The methods section should also distinguish boundaries from limitations. A deliberate decision to examine one policy cycle is a design boundary. An inability to access relevant policy records is a limitation that may affect the adequacy of evidence.

Both should be reported, but they are not the same methodological issue.

Bounding a University AI Assessment Policy Case Study

The resulting case definition provides a coherent basis for sampling, evidence selection, and analysis.

If the research question later changes to examine how national policy influenced AI governance across several universities, the original boundaries would no longer be sufficient. A multiple-case or broader policy research design might be more appropriate.

Common Mistakes When Defining Case Boundaries

How to Write a Defensible Case Boundary Statement

Begin with a sentence that identifies the case as precisely as possible. Then explain its organizational, spatial, event-based, and temporal limits, including only the dimensions relevant to the research question.

Distinguish what constitutes the case from what will be examined as contextual evidence. Specify any embedded units and explain how they contribute to the overarching analysis.

For educational technology research, particular attention should be given to the distinction between institutional membership and participation in digital environments. A learning platform may operate across campuses, homes, external service providers, and online communities.

The case boundary should reflect the analytical system being studied, not merely the physical location of the server or the institution purchasing the software.

Before Finalizing Case Boundaries, Verify These Conditions

Frequently Asked Questions About Case Study Boundaries

Good Case Boundaries Clarify the Inquiry Without Removing Essential Context

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