A psychology case study is a detailed, structured account of one person’s (or one group’s) experience with a psychological condition, treatment, or phenomenon. Whether you’re writing one for a university course or preparing a manuscript for publication, the process follows a consistent format: introduce the relevant literature, present the client’s background and symptoms, describe the treatment, and discuss what the case reveals about broader psychological theory. Here’s how to approach each part.
Choose Your Case Study Type First
Before you start writing, clarify what kind of case study you’re producing, because the type shapes everything from your research question to your structure. An intrinsic case study focuses on a single individual because that person’s experience is inherently interesting or unusual. You’re not trying to prove a broader point; you’re trying to capture the complexity of one case. Think of a patient with an exceptionally rare presentation of a well-known disorder.
An instrumental case study, by contrast, uses an individual case to explore a wider issue. You might document one client’s therapy to illustrate how a particular treatment approach works in practice. A collective case study examines several cases together to investigate a shared phenomenon, like how a specific stressor affects different people across cultural contexts. Knowing which type you’re writing helps you frame your introduction and decide how much emphasis to place on theory versus clinical detail.
Structure Your Case Study
The APA recommends four main sections for psychology case study manuscripts, and most university assignments mirror this format closely. Your total manuscript (for publication) should stay within about 30 pages, including the title page, abstract, and references. For a course assignment, your instructor will specify length, but the sections remain the same.
Introduction
This is not a summary of the case. It’s a focused literature review that tells the reader why this case matters. Identify the relevant psychological theories, the existing research on the condition or treatment you’re discussing, and the specific gap or question your case addresses. If you’re writing about a client with a hair-pulling disorder, for instance, you’d review what’s currently understood about that condition’s triggers, prevalence, and treatment outcomes. End the introduction by stating your aim: what does this case contribute to the field?
Case Context and Method
Describe the practical setup. Where did the treatment take place (private practice, university clinic, hospital)? What data sources did you draw on: session notes, audio recordings, self-report questionnaires, diary entries, information from family members, clinical records, or your own reflections as the therapist? Be explicit. This section also requires you to address confidentiality (more on that below) and whether the client consented to publication.
Case Description
This is the heart of the paper. Present the client’s background, including age, cultural identity, relevant family history, and the circumstances that brought them to treatment. The APA specifically calls for attention to intersecting identities: race, ethnicity, social class, gender, sexual orientation, religion, and disability status, among others. You’re not listing these for the sake of it. You’re providing context that helps the reader understand how the person experiences their condition and the world around them.
Next, describe the presenting problem in detail. What symptoms did the client report? When did they begin? What was the client’s own explanation for what was happening? Include specific behavioral examples. In a published case of hair-pulling disorder, for example, the authors noted that the client initially couldn’t identify her triggers, then gradually recognized boredom and unresolved anger (particularly from interpersonal conflict) as key drivers. She often didn’t realize she was pulling her hair until after the fact. That level of concrete detail is what makes a case study useful.
Then walk through the treatment. Describe the interventions you used and, critically, how they played out session by session or phase by phase. Case studies are valuable precisely because they show how change processes operate in an individual treatment, not just whether an intervention works on average across a group. Describe the therapeutic micro-processes: what you tried, how the client responded, what shifted, and what didn’t. If you adjusted your approach mid-treatment, explain why.
Discussion and Limitations
Analyze what went well and what didn’t, both in your case formulation and in the treatment itself. Connect your findings back to the literature you introduced at the start. Did the client’s experience confirm existing theory, challenge it, or reveal a nuance the research hadn’t captured? Be specific. If a well-established treatment model only partially fit your client’s situation, say so and explain what you think accounts for the gap.
Then name your limitations honestly. Maybe you didn’t have standardized assessment data at every time point. Maybe the treatment was cut short. Maybe the client’s self-reports were the only source of information about symptom change. Acknowledging these constraints doesn’t weaken your paper; it makes your conclusions more credible.
Integrate Diagnostic Criteria Carefully
If your case involves a formal diagnosis, ground it in current diagnostic standards. For most psychology case studies, that means referencing the DSM-5-TR. Don’t just state the diagnosis and move on. Show how the client’s symptoms map onto the diagnostic criteria, noting which criteria were clearly met, which were borderline, and which were absent. This is especially important when the presentation is atypical, because atypical presentations are often why a case is worth writing about in the first place.
Published teaching cases illustrate this well. A single diagnosis like Bipolar I Disorder can look dramatically different across individuals: one case might feature mood-congruent psychotic symptoms, another rapid cycling, another onset triggered by antidepressant treatment. Your job is to show the reader exactly how your client’s experience fits (or complicates) the diagnostic picture.
Use Outcome Measures to Support Your Narrative
A compelling case study doesn’t rely solely on your clinical impressions. Whenever possible, include objective or standardized measures that track the client’s progress over time. These might be validated questionnaires measuring symptom severity, mood, functioning, or quality of life, administered at intake, during treatment, and at discharge. If you used behavioral tracking (like having the client log specific behaviors in a diary), include that data too.
The combination of your qualitative observations and quantitative scores gives the reader two independent lines of evidence. If your narrative says the client improved and the standardized scores confirm it, your case is much stronger. If the scores tell a different story than your clinical impression, that discrepancy itself becomes something worth discussing.
Protect Your Client’s Identity
Confidentiality isn’t optional, and it requires more than changing a name. Standard approaches include using pseudonyms, initials, or numbers in place of the client’s real name. But you also need to alter or omit identifying details that could allow someone to recognize the person: their workplace, specific dates, unusual family configurations, or rare combinations of demographic characteristics.
For any case study intended for publication, you need the client’s informed consent. Describe in your manuscript what steps you took to prevent disclosure and whether the client agreed to have their case published. Some ethics frameworks now recommend tiered consent, where clients can choose their level of identification. A client might consent to full anonymity, or they might agree to certain details being included while others are withheld. Whatever approach you use, document it clearly in the Case Context and Method section.
Write With Precision and Restraint
Psychology case studies use a formal but readable tone. Write in the past tense when describing what the client reported and what happened during treatment. Use the present tense for established facts and theoretical claims (“Cognitive-behavioral therapy targets maladaptive thought patterns”). Most published case studies use third person throughout, referring to “the client” or “the therapist” rather than “I” or “me,” though some journals accept first person when describing therapeutic decisions.
Avoid vague language. Instead of writing “the client showed improvement,” specify what changed: “By session 12, the client reported pulling episodes had decreased from daily to roughly twice per week, and her score on the symptom measure dropped from 24 to 11.” Concrete details are what distinguish a useful case study from a generic summary.
Keep your interpretations clearly separated from your observations. When you describe what happened in session, that’s data. When you explain why you think it happened, that’s interpretation. Label it as such, especially in the discussion. If you’re proposing a new hypothesis based on what you observed, be transparent that it’s a hypothesis rather than a confirmed finding. This distinction is one of the markers of rigorous case study writing.
Common Mistakes to Avoid
- Skipping the literature review. A case study without theoretical grounding reads like a clinical note. The introduction is what transforms a patient record into a scholarly contribution.
- Being too vague about treatment. Saying “CBT techniques were applied” tells the reader almost nothing. Describe the specific interventions, the sequence, and the client’s response to each.
- Overclaiming from a single case. One case cannot prove that a treatment works. It can illustrate how a treatment works with a particular individual, suggest mechanisms worth studying further, or highlight clinical nuances that group studies miss. Frame your conclusions accordingly.
- Neglecting cultural context. A client’s cultural background shapes how they understand their symptoms, whether they seek help, and how they respond to treatment. Treating it as a checkbox item rather than an integrated part of the narrative weakens the entire case.
- Insufficient anonymization. Changing a name but leaving every other detail intact is not adequate protection. Review your manuscript specifically for combinations of details that could identify the individual, even if no single detail would.