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 contains eight fully worked case formulation examples across six frameworks, each on its own dedicated page with a complete filled-in write-up, a downloadable blank template, and step-by-step writing guidance. Every example describes a fictional client: all names, histories, and scores are invented for teaching purposes. This page is the map — it 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.
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 | The cognitive model: early experiences → core beliefs → intermediate beliefs → automatic thoughts | Planning and guiding cognitive-behavioral treatment; collaborative work shared with the client | Major depressive disorder with schema identification |
| 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 (six-step method) |
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.
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. That discipline makes the 5 Ps the standard in many counseling programs and in substance use settings, and the better choice whenever 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 with Schema Identification
The CBT case conceptualization applies Judith Beck's cognitive conceptualization diagram: it traces a vertical chain from relevant early experiences down to core beliefs, the intermediate beliefs (rules, attitudes, assumptions) that operationalize them, the compensatory strategies built around them, and the situation-specific automatic thoughts that bring the client to treatment. 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 was contingent on achievement. From the core beliefs "I am not good enough" and "I have to earn people's love," the example maps compensatory overworking and avoidance of evaluation, then analyzes three concrete situations — a "Meets Expectations" performance review, a canceled lunch, a failed dinner-party recipe — showing for each the automatic thought, the emotion with intensity ratings, the behavior, and the core belief it confirms. The cross-cutting pattern section then explains how a convergence of stressors overwhelmed her compensatory strategies and activated the depressive episode, and the treatment implications sequence interventions from behavioral activation up through schema-level work.
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. Built around the six-step differential method from the DSM-5-TR Handbook of Differential Diagnosis, it documents rule-in and rule-out evidence for each candidate diagnosis, 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 walks the six steps explicitly for a PTSD vs. adjustment disorder vs. GAD vs. panic disorder differential after a motor vehicle accident, showing the substance-induced step doing 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 →
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 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.