What Is a Case Formulation?
A case formulation — the term is fully interchangeable with case conceptualization — is a clinical hypothesis that explains why a particular client is experiencing particular difficulties at a particular time. Where a diagnosis classifies the problem, a formulation explains it: what made this person vulnerable, what triggered the current episode, what keeps it going, and what strengths can be recruited for recovery. It is the bridge between assessment data and a treatment plan, and it is the piece of clinical writing that reviewers, supervisors, and training programs scrutinize most closely.
The fastest way to learn to write one is to read good finished examples — and that is what this page collects. This library links to six dedicated framework pages, each with fully worked case formulation examples, each with a complete filled-in write-up, a downloadable blank template, and step-by-step writing guidance. This page adds two more further down: a social work example and a child and adolescent example. Every example describes a fictional client: all names, histories, and scores are invented for teaching purposes. This page is the map — it explains how to write a formulation step by step, summarizes each framework in a paragraph, excerpts its worked example so you can see the style before you click through, and helps you choose the right model for your setting. If you are looking specifically for a CBT case conceptualization, see the CBT case conceptualization guide.
What a Case Formulation Includes
Frameworks name their parts differently, but most case formulations cover the same ground:
- The presenting problem: what the difficulties are, how severe they are, how long they have lasted, and how they affect daily functioning
- Vulnerabilities: history, temperament, family background, and learned beliefs that made the problem more likely
- Triggers: what happened before onset or before the current episode
- Maintaining factors: what keeps the problem going, such as avoidance, ongoing stress, substance use, or how others respond
- Strengths and protective factors: what the client can draw on for recovery
- Context: cultural, family, social, and practical circumstances that shape the problem and the options for treatment
- A working hypothesis: a short narrative that ties these together and explains why this problem, in this person, now
- Treatment implications: what the hypothesis says treatment should target first
A diagnosis, if one is given, sits alongside the formulation rather than replacing it.
How to Write a Case Formulation Step by Step
These steps work with any framework on this page. The framework decides how you sort the information; the steps stay the same.
Step 1: Define the problem first. Write two or three sentences describing what the client is struggling with, in concrete terms: symptoms, severity (with measure scores if you used any), duration, and the effect on work, school, relationships, or self-care. Note why the client is seeking help now.
Step 2: Pick one framework. Use the one your setting requires. If you have a free choice, the 4 Ps is a reliable default; see the comparison table below.
Step 3: Sort the assessment data. Go through your intake, history, mental status exam, and measure results, and place each relevant finding in a category of your framework. Leave out history that does not help explain the problem.
Step 4: Write the working hypothesis. This is the step that turns a list into a formulation. In one paragraph, explain how the factors connect: how a vulnerability and a trigger combined to start the problem, and how the maintaining factors keep it going. Name the cycle if there is one.
Step 5: Link the hypothesis to treatment. For each maintaining factor, name the intervention that targets it. Use the protective factors to decide what treatment can build on. Your treatment plan goals should trace back to factors named in the formulation.
Step 6: Check it and plan to revise it. Ask whether a colleague could read the formulation and predict what treatment you are offering. Note any open questions (for example, an unconfirmed history or a differential still to resolve) and revisit the formulation as treatment adds information.
Choosing a Framework: Comparison Table
Six frameworks are covered in this library. They are complementary lenses rather than competitors — several are routinely combined — but each has a home territory where it fits best.
| Framework | Organizing principle | Best for | Worked example(s) in this library |
|---|---|---|---|
| 4 Ps | Function and timing: predisposing, precipitating, perpetuating, protective factors | General-purpose formulation in any orientation; team communication; identifying treatment targets | Generalized anxiety disorder (grid format); recurrent major depression (narrative format) |
| 5 Ps | The 4 Ps plus a formal Presenting category describing the problem before explaining it | Counseling and substance use settings; standalone formulations and case presentations; training | Alcohol use disorder with co-occurring depressive symptoms |
| Biopsychosocial | Domain: biological, psychological, and social factors and their interactions | Medical comorbidity; integrated care; complex presentations spanning health and social context | Comorbid depression and chronic pain |
| CBT conceptualization | Agreed treatment priorities, working explanations and treatment decisions informed by the cognitive-behavioral model | Planning and guiding cognitive-behavioral treatment; collaborative work shared with the client | Major depressive disorder |
| Psychodynamic | Unconscious conflict, object relations, defenses, and transference patterns | Psychodynamic therapy; personality-level and relational presentations; understanding symptom meaning | Attachment-related relationship difficulties |
| Diagnostic | Systematic differential diagnosis: rule-in/rule-out reasoning toward a justified diagnosis | Ambiguous or overlapping presentations; documenting clinical reasoning for the record | Depression vs. bipolar II vs. ADHD; PTSD vs. adjustment disorder vs. GAD vs. panic |
A useful way to hold the set in mind: the 4 Ps and 5 Ps organize data by function and timing, the biopsychosocial model organizes it by domain, the CBT and psychodynamic models interpret it through a theory of mechanism, and the diagnostic formulation sits downstream of all of them, converting the explanatory work into a defended diagnosis.
4 Ps vs. 5 Ps
The two most-used general frameworks differ by one category. The 4 Ps sorts information into predisposing, precipitating, perpetuating, and protective factors, usually after a short summary of the presenting problem. The 5 Ps makes that summary a formal first category, Presenting, held to the same level of detail as the other four. The explanatory part of both models is the same.
| 4 Ps | 5 Ps | |
|---|---|---|
| Categories | Predisposing, Precipitating, Perpetuating, Protective | Presenting, plus the same four |
| Fits best | Inside a full assessment report that already describes the problem | A standalone formulation, case presentation, or training exercise |
| Switching | Add a structured Presenting section | Fold Presenting into an opening summary |
Use whichever your program or agency uses. The 5 Ps guide has a fuller comparison and a worked example, and the 4 Ps guide has two worked examples in grid and narrative formats.
The Example Gallery
Each entry below gives a one-paragraph orientation to the framework, a condensed excerpt from its worked example, and a link to the full write-up. The excerpts are teasers — the canonical, complete examples (with templates and downloads) live on the framework pages. All clients are fictional.
1–2. The 4 Ps: GAD (Grid) and Recurrent Depression (Narrative)
The 4 Ps case formulation, systematized by Priyanthy Weerasekera in 1993, sorts every piece of clinical data by the functional question it answers: Predisposing (why was this person vulnerable?), Precipitating (why did it start now?), Perpetuating (why hasn't it resolved?), and Protective (what buffers against worsening?). Because it is theoretically neutral, it is the most widely applicable framework in this library and a natural shared language for multidisciplinary teams. The 4 Ps page contains two complete worked examples in deliberately contrasting formats.
The first example formulates generalized anxiety disorder for a fictional 41-year-old father using a 3x4 grid that crosses the four Ps with biological, psychological, and social domains. It traces a family history of anxiety and an upbringing that "equated vigilance with safety" through a precipitating cluster — his son's brief hospitalization and a workplace reorganization — into the maintaining loops of worry-as-avoidance, checking behaviors, sleep deprivation, and a spouse's well-intentioned accommodation. The second example formulates recurrent major depressive disorder for a fictional 29-year-old software developer in flowing narrative paragraphs: a loaded diathesis (family history, two prior episodes, a productivity-contingent self-worth schema he calls "the auditor") activated by a breakup and a first negative performance review, then maintained by behavioral withdrawal, rumination, evening alcohol use, and concealment. Both close with an integrated synthesis that converts the perpetuating loops directly into treatment targets.
Read both full 4 Ps examples and download the template →
3. The 5 Ps: Alcohol Use Disorder with Co-Occurring Depression
The 5 Ps case formulation is the 4 Ps with one addition: the Presenting problem is promoted from an introductory summary to a formal category with its own documentation standards — concrete symptoms, measure scores, functional impairment, and the reason treatment is being sought now, described before any explanation begins. The 5 Ps is used in counseling, including substance use counseling, and is a good choice when a formulation must stand alone as a self-contained document.
The worked example formulates alcohol use disorder with co-occurring depressive symptoms for a fictional 34-year-old warehouse supervisor referred through his employer's EAP. The Presenting section anchors severity with an AUDIT of 24 and a PHQ-9 of 14; the explanatory Ps then trace paternal alcohol dependence and an emotion-avoidant upbringing (predisposing) through a divorce that "dismantled the very structures that had contained his earlier drinking" (precipitating) into a shame–use cycle, cue-saturated evenings, and a drinking-centered social network (perpetuating), balanced against a deeply valued paternal identity and demonstrated prior capacity for remission (protective). The page also includes a full 4 Ps vs. 5 Ps comparison for choosing between the variants.
Read the full 5 Ps example and download the template →
4. Biopsychosocial: Comorbid Depression and Chronic Pain
The biopsychosocial case formulation, rooted in George Engel's 1977 model, organizes clinical data by domain — biological, psychological, and social — and then does the work that distinguishes a formulation from a categorized assessment: explaining how the domains interact. It is the framework of choice when medical comorbidity, health behavior, or social context is central to the presentation, and it combines naturally with the 4 Ps (the 3x4 grid used in the GAD example above is exactly that combination).
The worked example formulates recurrent major depression comorbid with chronic low back pain for a fictional 52-year-old retired school administrator. It shows what genuine cross-domain integration looks like: genetic vulnerability and pain-disrupted sleep (biological) reactivating depression in a woman whose self-concept was built on competence and independence (psychological), while early retirement, marital strain, and a stoic family culture strip away social buffers (social). The integrated formulation names the self-reinforcing cycle — pain disrupts sleep, which worsens depression, which reduces activity, which increases deconditioning and pain — and derives seven treatment recommendations that each intervene at a specific point in that cycle.
Read the full biopsychosocial example and download the template →
5. CBT Case Conceptualization: Depression
The CBT case conceptualization connects current difficulties with working hypotheses and treatment decisions, organized around the problems the client and clinician agree to work on first. Unlike the theory-neutral frameworks above, it is a modality-specific tool: it exists to guide cognitive-behavioral treatment and to be shared collaboratively with the client.
The worked example conceptualizes major depressive disorder in a fictional 34-year-old raised in a family where approval depended on achievement. It explains how beliefs about having to earn people's regard, together with overworking and withdrawal, may keep her distress going, and links those patterns to behavioral activation, cognitive work and behavioral experiments. The same page adds a narrative example for a college student with social anxiety.
Read the full CBT conceptualization example and download the template →
6. Psychodynamic: Attachment-Related Relationship Difficulties
The psychodynamic case formulation explains symptoms in terms of unconscious conflict, internalized relational patterns, characteristic defenses, and the way early experience is re-enacted in present relationships — including the therapeutic one. Drawing on Nancy McWilliams' approach and the PDM-2 framework, it is the deepest of the six models and the right choice when relational difficulties or personality-level patterns are the clinical center of gravity.
The worked example formulates recurrent relationship difficulties with chronic emptiness and abandonment fear for a fictional 29-year-old woman whose early caregiving alternated unpredictably between warmth and withdrawal — "I never knew which mom I was going to get." The formulation traces that history into a split internal object world (idealized others who flip to abandoning ones), predominant defenses of splitting and projective identification, and a transference sequence in which early idealization of the therapist gave way to anger when the treatment frame was maintained — directly mirroring her relational template. The central psychodynamic theme names the core conflict: an intense wish for a reliable attachment figure alongside the equally intense expectation, engineered into reality by her defenses, that no such figure exists.
Read the full psychodynamic example and download the template →
7–8. Diagnostic Formulation: Two Complete Differentials
The diagnostic formulation answers a different question from every framework above: not why does the client have this problem but what, precisely, is the problem — and how do you defend that conclusion on the record. It works candidate by candidate, documenting rule-in and rule-out evidence for each diagnosis considered, handles provisional diagnoses, and links the resolution of the differential to treatment decisions. The page contains two complete worked differentials.
The first works through a depression vs. bipolar II vs. ADHD differential for a fictional 27-year-old with a partial SSRI response, ambiguous high-energy periods, and lifelong inattention corroborated by old school records — concluding with a supported ADHD diagnosis, a retained MDD diagnosis, and a provisional bipolar II diagnosis with an explicit 8–12-week plan (mood charting, collateral history) to resolve it. The second works through a PTSD vs. adjustment disorder vs. GAD vs. panic disorder differential after a motor vehicle accident, where the question of a substance-induced cause does real diagnostic work: the trauma symptoms preceded the escalation in evening drinking, so alcohol is documented as a maintaining comorbidity rather than the primary etiology.
Read both full diagnostic formulation examples and download the template →
Case Formulation Example for Social Work
Social work formulations use the same structure but give more weight to the client's environment: housing, income, transportation, caregiving, community ties, and access to services. This reflects the person-in-environment perspective that is central to social work practice (NASW Press publishes a Person-in-Environment classification system built on it). A social work formulation also tends to lead to a service plan that mixes counseling with practical help, such as referrals, benefits, and care coordination. It does not need a psychiatric diagnosis to be useful.
The example below uses the 4 Ps with an explicit environment focus. The client is fictional.
Case Formulation — Social Work (Older Adult, Bereavement and Isolation)
Client: R.T. (fictional) | Age: 74 | Setting: Primary care–based social work, referral from the client's physician after three missed appointments and a 4 kg weight loss over two months
Presenting problem: R.T. is a retired bus mechanic who has lived alone since his wife died eight months ago. He describes low mood most days, poor appetite, and "no reason to go out." PHQ-9 total: 15 (moderately severe). He has stopped attending his weekly church breakfast, has missed medical appointments, and his refrigerator held little food at the home visit. He denies suicidal ideation, intent, or plan, and reports no past suicidal behavior. He reports no firearms in the home. He drinks one or two beers most evenings, unchanged from before his wife's death.
Predisposing: A lifelong pattern of handling problems privately; his wife managed the household, social calendar, and his medical appointments. Hearing loss makes phone calls and group conversation tiring. One prior period of low mood after a work injury in his fifties that resolved without treatment.
Precipitating: His wife's death eight months ago, followed four months later by the loss of his driver's license after a vision assessment.
Perpetuating: No transportation to church, shopping, or appointments; the bus route near his home was cut last year. His daughter lives in another state and calls weekly but does not know how much he has withdrawn. He skips meals because he never learned to cook and finds shopping by phone difficult with his hearing. Isolation and low mood reinforce each other: the less he goes out, the less he feels able to.
Protective: Long-standing faith community that has asked after him; a close relationship with his daughter; no history of suicidal behavior; he agreed to the home visit and says he wants "to feel like myself again." Stable housing and a pension that covers basic costs.
Working formulation: R.T.'s low mood began after the loss of his wife, who had held most of his practical and social structure. A long habit of self-reliance, hearing loss, and then the loss of driving turned grief into isolation. His current difficulties are now kept going less by grief itself than by practical barriers (no transport, no meal routine, missed medical care) and by withdrawal that removes the contact that used to support him. His strengths, especially his church community and his daughter, are intact but currently out of reach.
Service plan implications:
- Share findings with his physician (with R.T.'s consent) and ask for a medical review of the weight loss, low mood, and his evening alcohol use, including whether medical causes need to be ruled out
- Arrange a referral for counseling focused on bereavement and low mood, with an option for home or telehealth sessions
- Connect R.T. with local transportation options for older adults and help with the application
- Refer to a home-delivered or congregate meals program
- With his permission, contact his daughter and his church to rebuild regular contact
- Discuss a hearing reassessment and phone options for people with hearing loss
- Repeat the PHQ-9 and a risk check at each contact; give R.T. crisis contacts, including the 988 Suicide & Crisis Lifeline (call or text 988 in the US), and review them with him
This is a sample for educational purposes only — not real patient data.
For writing ongoing social work and case management notes after the formulation, see the DAP note template, which includes a section on DAP notes in social work and case management.
Case Formulation with Children and Adolescents
The frameworks on this page were mostly developed with adults in mind, so a formulation for a child or teenager needs a few adjustments. The IACAPAP chapter on case formulation in child and adolescent mental health (Henderson and Martin, 2014) recommends several of them:
- Record two chief complaints. The adults who bring the child in and the child often see the problem differently. Write down both, even if the child's view is "I don't know."
- Give family and school their own sections. For a child, these are more than a line under "social." Stressors at home and at school can cause symptoms, worsen them, or be a reaction to them.
- Build development into every section. Whether a behavior is a concern depends on what is typical at the child's age. Do not leave development as a single paragraph that nothing else refers to.
- Use plain, precise language. Avoid adult clinical terms unless they truly fit what the child described.
Collect information from more than one source where you can, such as parents or caregivers, teachers, school records, and the child's own account, and note where the sources disagree.
Rules about who can see a minor's records, and what you can share with parents, vary. Under HIPAA, a parent who has authority under state law to make the minor's health care decisions is generally treated as the minor's personal representative. There are exceptions, for example when the minor consents to care that the law lets them receive without a parent's consent, or when the parent agrees to a confidential relationship between the provider and the minor, and state law can permit or prohibit disclosure to parents (45 CFR 164.502(g)(3)). Check your state's laws and your agency's policy before deciding how to share the formulation with the family.
The working diagnosis in the example below is described in this library's own words; see the American Psychiatric Association's anxiety disorders fact sheet and the DSM-5-TR for the criteria.
Case Formulation — Adolescent (School Avoidance with Social Anxiety)
Client: E.M. (fictional) | Age: 13 | Grade: 8 | Informants: E.M., mother, school counselor (with parental consent and E.M.'s assent) Working diagnosis: Social anxiety disorder (F40.10, Social phobia, unspecified)
Presenting problem:
- Mother's concern: E.M. has missed 14 school days this semester, usually after morning stomachaches, and "melts down" when pushed to go.
- E.M.'s concern: "Everyone stares at me in class. I just want them to stop calling on me."
E.M. describes intense worry about being judged by classmates, especially when speaking in class, eating in the cafeteria, or changing for gym. On school mornings she has stomachaches and nausea that ease once she is allowed to stay home. Her pediatrician found no medical cause for the stomachaches last month. Grades have dropped from mostly As to Bs and Cs. She keeps two close friends online and still enjoys drawing. She denies suicidal thoughts and self-harm; her mother and the school counselor report no concerns about either. There is no evidence of bullying from E.M., her mother, or the school.
Predisposing:
- Child: Described as shy and slow to warm up since preschool. Her mother has a history of anxiety treated in her twenties.
- Family: A warm, close relationship with her mother; her mother tends to step in quickly when E.M. is upset.
- Development: Early adolescence, when sensitivity to peer judgment typically increases.
Precipitating:
- School: The move from a small elementary school to a large middle school last year, and an incident in September when she froze during a class presentation and some classmates laughed.
Perpetuating:
- Child: Avoidance of speaking, eating in front of others, and school itself brings short-term relief, so the fear never gets tested. Worry about the next day starts on Sunday evening.
- Family: Staying home on bad mornings, and her mother calling the school to excuse her from presentations, reduce distress in the moment but keep the avoidance going. Her mother's own worry makes it hard to hold the line.
- School: Missed lessons and growing make-up work add a new reason to dread going back.
Protective:
- Child: Strong academic ability, a creative interest she enjoys, and two steady friendships. She says she wants to "be normal at school again."
- Family: A caring, engaged mother who is willing to come to sessions.
- School: A school counselor who knows E.M. and is willing to help plan a gradual return.
Working formulation: E.M. has a temperament and family history that make social fear more likely, and she reached the most peer-sensitive stage of development just as she moved into a much larger school. The presentation incident turned a general shyness into a specific fear of being judged. Since then, avoidance at school and well-meant accommodation at home have kept her from learning that she can cope with these situations, and each missed day makes returning harder. Her abilities, friendships, motivation, and supportive adults give treatment a strong base.
Treatment implications:
- CBT for social anxiety, including graded exposure to feared school situations, planned with E.M.
- Parent sessions on reducing accommodation and supporting brave behavior while staying warm and calm
- A gradual school-return plan agreed with E.M., her mother, and the school counselor, with a named adult at school and a quiet place to go if distress peaks
- Agree with the school how classroom participation will build up over time, rather than ongoing exemptions
- Monitor attendance weekly and review the formulation at six weeks; repeat the risk check at each session
- If her mother's own anxiety makes the plan hard to follow, discuss whether she would like support for herself
This is a sample for educational purposes only — not real patient data.
Grid vs. Narrative Format
Formulations are written in two broad formats, and the choice is independent of the framework. The grid or table format — used in the GAD example, which crosses the 4 Ps with the three biopsychosocial domains — is fast to write, easy to scan in team meetings, and guards against missing a domain. The narrative format — used in the recurrent-depression, 5 Ps, biopsychosocial, and psychodynamic examples — reads as connected prose and is preferred for comprehensive evaluations, reports read by other providers, and any formulation where the interaction between factors carries the explanatory weight. The 4 Ps page presents the same framework in both formats back to back, which makes it the best single page for seeing the trade-off.
Whichever format you choose, the standard is the same: a sorted table or a tidy set of paragraphs is only organized data until it ends with an integrated synthesis that explains mechanism — how vulnerability, trigger, and maintenance interact, and which factors treatment will target.
How Long Should a Case Formulation Be?
There is no standard length. It depends on the setting, the purpose, and any template your agency or program requires. A formulation in a brief team presentation may be a single paragraph; one in a comprehensive evaluation or a training case write-up is usually longer. The IACAPAP chapter linked above describes a good formulation as a coherent story that is "not necessarily lengthy."
A useful test is whether every sentence helps explain the problem or guide treatment. If a section only repeats history that appears elsewhere in the record, cut it. If the working hypothesis is missing, the formulation is too short no matter how many pages it fills. The worked examples on this page and on the framework pages show a typical range.
How to Pick: A Short Decision Guide
- Your setting specifies a model? Use it. The frameworks are interconvertible enough that nothing is lost, and consistency with your documentation standard matters more than personal preference.
- General-purpose formulation, any orientation: start with the 4 Ps. If the formulation must stand alone — a case presentation, transfer summary, or substance use intake — use the 5 Ps so the presenting picture travels with the explanation.
- Medical comorbidity, integrated care, or heavy social context: use the biopsychosocial formulation, and consider crossing it with the 4 Ps in a 3x4 grid for the best of both.
- Delivering CBT: write a CBT case conceptualization — it doubles as a collaborative tool you share with the client and updates session by session.
- Relational or personality-level presentations, psychodynamic treatment: write a psychodynamic formulation.
- The diagnosis itself is the open question: write a diagnostic formulation first — the explanatory frameworks work best once the differential is at least provisionally resolved.
However you combine them, keep the golden thread intact: assessment findings feed the formulation, the formulation justifies the diagnosis and treatment plan, and every treatment recommendation should be traceable to a factor the formulation identified. And treat every formulation — in whichever framework — as a working hypothesis to be revised as treatment reveals new information.