The term “case study” is used loosely across disciplines, so start with what it means in psychology specifically. A case study is a detailed, systematic description of a single unit, usually one person, sometimes a family, a classroom, or an organization, that draws on multiple sources of information (interviews, observation, history, test results, records) to build a full picture of that unit over time. It is a research method, a clinical document, and a teaching tool, and the student assignment sits at the intersection of all three.
Definition, and what makes it a method
The defining features:
- One unit, studied in depth. The case is a whole, not a data point. A survey asks the same three questions of 500 people; a case study asks 300 questions of one.
- Multiple sources. A single interview is a conversation. A case study triangulates: what the person reports, what others observe, what records show, what standardized measures indicate.
- Context preserved. The person is described inside their circumstances (family, work, history, culture) rather than abstracted from them.
- Time. Most case studies follow the unit across a period: before, during, and after something.
Psychology uses the method for four purposes. It describes rare or new phenomena that cannot be studied in groups. It generates hypotheses that group studies later test. It illustrates how a theory looks in a real life. And it tests limits: one well-documented case can show that something a theory rules out has happened. What the method cannot do is establish general causes or treatment effects, because there is no comparison group. A well-written discussion section says so explicitly.
Courses assign case studies to practice a skill that lectures cannot teach: taking a mass of specific, messy information about one person and organizing it into a coherent account that connects observation to theory. If your assignment is instead an argumentative essay on a psychological topic, How to Choose a Psychology Essay Topic You Can Actually Argue is the relevant guide.
The seven-section structure
Most instructors and clinical training programs use a version of this order. Headings vary; the logic does not. Each section answers a question, and the sections build on each other.
1. Background (identifying information and history)
Who is this person, in context? Age, relevant demographics, living situation, education or occupation, family structure, and the history that bears on the case: developmental, medical, educational, social. Keep it relevant. A case study about test anxiety does not need the person’s full medical history; it needs their academic history and any prior anxiety.
2. Presenting problem
Why is this person here now? State the concern in the person’s own terms first (what they say is wrong, in their words if you have them), then in observational terms (what you or the referring party saw). Include onset, duration, frequency, and severity, and what the person has already tried. This section is short and specific.
3. Assessment
What information was gathered, and how? List each source: clinical interview, structured questionnaire, behavioral observation, collateral reports from family or teachers, records. For each, report what it showed, without interpreting yet. If standardized instruments were used, name them and give the scores with what range they fall in. This is the evidence section; the next section interprets it.
4. Diagnosis or formulation
What is going on, and why? In clinical assignments, this section states a diagnostic impression, with the criteria met and the evidence from section 3 for each. In most undergraduate assignments, and in many clinical ones, the emphasis is on formulation: a theory-guided explanation of how the problem developed and what maintains it. A common frame is the four Ps: predisposing factors (what made the person vulnerable), precipitating factors (what triggered the problem now), perpetuating factors (what keeps it going), and protective factors (what strengths and supports exist). This is where the theory you have been taught does its work.
5. Intervention
What was done about it? Describe the approach chosen, why it fits the formulation, and what it consisted of in practice: how many sessions, what techniques, what the person was asked to do between sessions. Tie the choice to the formulation: if the perpetuating factor is avoidance, the intervention should target avoidance.
6. Outcome
What changed? Report the same measures from the assessment section again, so change can be seen. Include the person’s own report and any observational or collateral evidence. Be honest about partial or no improvement; a case study that reports perfect recovery reads as fiction, and in coursework it usually is.
7. Discussion
What does this case teach, and what are its limits? Connect the case to the theory you were taught and to the published literature, using the same source-mapping habits as a literature review. Say what the case illustrates, what it complicates, what alternative formulations were possible, and what the method cannot establish. Note limitations specific to this case: missing information, reliance on self-report, short follow-up. End with implications for practice or research, stated modestly.
The structure looks like an IMRaD research paper with the sections renamed, and the reason is the same: the reader needs evidence before interpretation, and the intervention before its result. If you are outlining a longer version, Research Paper Outline: APA and MLA Templates With a Sample shows the empirical template this structure descends from.
A fictional sample case study
The case below is invented for teaching. The client does not exist, the details are constructed to illustrate the sections, and nothing here is clinical guidance. It is written at the level of a 2,000-word undergraduate assignment, condensed to show one or two paragraphs per section.
Background. “D.” is a 19-year-old second-year university student living in a shared apartment near campus. D. is the eldest of three children; both parents work full time. D. reports an unremarkable developmental and medical history. Academic performance through high school was strong. D. describes the family as “close but busy,” with high expectations around grades. D. was referred to the university counseling center by an academic adviser after missing two midterm examinations.
Presenting problem. D. describes “freezing up” before exams: for roughly three weeks before a test, D. reports difficulty concentrating, disrupted sleep, and a racing heart when opening study materials. On the two missed exams, D. reports arriving at the building and being unable to enter. The pattern began in the first term of university; D. denies similar problems in high school. D. has tried studying longer hours, which D. says made the anxiety worse.
Assessment. Information came from two clinical interviews, a self-report anxiety questionnaire, a one-week sleep and study log kept by D., and, with D.’s permission, a brief conversation with the adviser. The questionnaire score fell in the range the instrument describes as moderate to high. The log showed study sessions of four to six hours on most days, each ending in D. stopping early because of physical symptoms. The adviser described D. as “clearly capable” and noted that D.’s coursework submitted outside exam conditions was consistently strong.
Formulation. Predisposing: high family expectations and a self-image built on academic success made grades central to D.’s sense of worth. Precipitating: the shift from high school, where D. was the top student, to a university cohort where D. was average, removed the reassurance of easy success. Perpetuating: D. responds to anxiety by studying longer, which increases exhaustion and reinforces the belief that the exam is a threat; avoiding the two exams brought immediate relief, which strengthens avoidance. Protective: strong non-exam coursework, an engaged adviser, and D.’s own willingness to seek help. The pattern is consistent with the cognitive-behavioral account of performance anxiety in which catastrophic appraisal, physiological arousal, and avoidance reinforce one another.
Intervention. Eight weekly sessions of a cognitive-behavioral approach. Components: education about the anxiety-avoidance cycle; identifying and testing the belief “if I do badly on this exam, my future is over”; capping study sessions at ninety minutes with scheduled breaks; a graded exposure sequence beginning with sitting in the exam building between classes and progressing to a practice exam under timed conditions; and a brief breathing routine for use before entering an exam room.
Outcome. By session eight D. had completed two exams. Questionnaire score fell to the range the instrument describes as mild. Sleep log showed average sleep increased by about an hour on nights before study sessions. D. reported that anxiety before exams was “still there but I can walk in.” D. rated the study-session cap as the most useful component. No follow-up beyond the eighth session was available.
Discussion. This case illustrates the maintaining role of avoidance in performance anxiety and the way a reasonable-seeming coping strategy (studying more) can perpetuate the problem. The intervention’s apparent effect cannot be separated from other changes across the term, including the natural decline of first-year adjustment stress. Assessment relied mainly on self-report; a behavioral observation during an exam was not possible. The absence of follow-up leaves the durability of change unknown. An alternative formulation emphasizing perfectionism as the primary factor would have shifted the intervention toward beliefs about self-worth rather than the exam itself; the data here do not decide between the two. The case suggests that early screening for exam avoidance after the high-school-to-university transition may be worth studying in a larger sample.
What to notice. The background stops at what the formulation needs. The presenting problem gives onset, duration, and what was tried. The assessment reports findings without interpreting them; the formulation interprets them using a named framework and the four-P structure. The intervention components each map to a perpetuating factor. The outcome repeats the assessment measures and includes a limitation (no follow-up). The discussion states what the case cannot show, names an alternative formulation, and proposes a modest next step. The client is identified by an initial, and identifying details are generic.
Confidentiality rules for the assignment
Even when the case is fictional, instructors expect the conventions followed, because the assignment is training for real practice.
- No names. Use initials, a pseudonym, or “the client.” Say which you are using and that it is not the person’s real name.
- No identifying combinations. Age, occupation, city, and a rare condition together can identify someone. Round ages, generalize occupations, omit locations.
- No direct quotations that could be traced. Paraphrase, or quote only generic statements.
- Consent stated. In a real case, note that written consent for educational use was obtained. In a fictional case, state in a footnote or author’s note that the case is constructed.
- Collateral sources treated the same way. The adviser, parent, or teacher is also unnamed.
APA style points specific to case studies
Case study assignments in psychology are written in APA style. The formatting is the same as any APA paper (title page, running head where required, double spacing, References page), and How to Format a Research Paper in APA Style, Step by Step covers that. Points that apply particularly here:
- Headings. The seven sections are level-1 headings; subsections within assessment or formulation (for example, “Interview” and “Questionnaire”) are level 2.
- Tense. Background, presenting problem, assessment, intervention, and outcome are in past tense (what happened). Formulation and discussion mix past for the case and present for theory (“the cognitive-behavioral model holds that…”).
- Person-first, non-judgmental language. “A student with test anxiety,” not “an anxious student.” “Reported,” not “admitted” or “claimed.”
- Instruments. Name a standardized measure in full at first mention with its citation, then by abbreviation. Report scores with the interpretive range the instrument’s manual gives, not your own labels.
- Citations in the formulation and discussion. The theory you use to explain the case comes from somewhere; cite it. A formulation with no citations is an opinion.
Common mistakes
- Formulation before evidence. Interpreting in the assessment section, or stating a diagnosis in the presenting problem. Keep observation and interpretation in their own sections.
- Formulation without theory. A list of what happened is a timeline, not a formulation. Name the framework and use its terms.
- Intervention disconnected from formulation. If the perpetuating factor is avoidance and the intervention is journaling, the reader will ask why.
- Perfect outcomes. Full recovery with no residual symptoms and no limitations. Report partial change and say what is unknown.
- Discussion that overclaims. “This case proves that CBT works for test anxiety.” One case proves nothing about the general population; write “is consistent with.”
- Giving clinical advice. The assignment is a write-up, not a treatment plan for anyone real. Keep the intervention section descriptive of what was done in the case, not prescriptive.
Checklist
- Definition of the case (who, what unit) clear in the first paragraph of the background
- Background limited to what the formulation needs
- Presenting problem includes onset, duration, severity, and prior attempts
- Every assessment source named, with findings reported before interpretation
- Formulation uses a named theoretical framework and the four Ps (or the framework your course specifies)
- Each intervention component tied to a factor in the formulation
- Outcome repeats the assessment measures and notes follow-up (or its absence)
- Discussion names at least one alternative formulation and the method’s limits
- Client anonymized; consent or fictional status stated
- APA headings, tense, language, and citations checked
- No advice to real people anywhere in the paper
Frequently asked questions
Is a psychology case study qualitative or quantitative?
Primarily qualitative. A case study builds a detailed description of one person, group, or situation from interviews, observation, records, and history. It can include quantitative elements, such as scores on a standardized questionnaire tracked over time, but the method is defined by depth on a single case rather than measurement across many. Your write-up should describe both kinds of information if both were used, and say which came from where.
Can a case study prove a theory?
No, and your discussion section should say so. A single case can illustrate a theory, generate a hypothesis, or show that something a theory says is impossible has in fact occurred. It cannot establish that a treatment works in general or that a cause produces an effect in most people. Write your conclusions as “this case is consistent with” rather than “this case demonstrates that.”
How long is a case study assignment in a psychology course?
Undergraduate case study papers usually run 1,500 to 3,000 words, with the background and assessment sections taking about half of that. Graduate clinical programs assign longer ones, sometimes 5,000 words with appendices for assessment instruments. Whatever the length, the discussion section should be at least a fifth of the paper; an assignment that is all description and no interpretation misses the point of the exercise.
Do I need to use a real client for a case study assignment?
Only if your program provides one under supervision with consent already obtained, which happens in practicum courses. For most coursework the instructor supplies a case vignette or asks you to construct a fictional one. Never write up a friend, family member, or yourself as a case, even anonymized; instructors treat that as an ethics problem, and the personal involvement makes the formulation unreliable anyway.