How Therapists Formulate a Case: A Step-by-Step Psychological Guide

Introduction

When someone starts therapy, it can feel like the therapist is simply listening, asking questions and offering reflections. But beneath that conversation, something more structured is happening. Therapists are building a case formulation. This is a psychological map. It helps explain why a person is struggling, what maintains those difficulties, and how change can happen. Rather than focusing only on symptoms, formulation looks at the whole person—their history, relationships, thoughts, emotions and environment. In modern mental health practice, case formulation is considered essential. It guides intervention, improves outcomes and allows therapy to be tailored to the individual rather than applying a one-size-fits-all approach. In this article, we explore how therapists formulate a case step by step, using research-informed models from contemporary psychology.

What Is Case Formulation?

Case formulation is a structured way of understanding a client’s difficulties. It answers key questions:

• What is happening?
• Why is it happening?
• What keeps it going?
• What might help?

Unlike diagnosis alone, formulation is:

• individualised
• collaborative
• dynamic (it evolves over time)

Research highlights that case formulation improves treatment planning and therapeutic outcomes when used effectively (Kuyken, Fothergill, Musa, & Chadwick, 2016).

Why Case Formulation Matters in Mental Health

A diagnosis may label a problem. A formulation explains it. This distinction is important. Two individuals may both experience anxiety, yet the underlying causes and maintaining factors may be very different. One may be driven by trauma, another by perfectionism and another by health anxiety. Formulation allows therapy to be:

• targeted
• meaningful
• flexible

It also helps clients make sense of their experiences, which in itself can be therapeutic.

The Foundations of Case Formulation

Most formulations draw from established psychological models. Common approaches include:

• Cognitive Behavioural Therapy (CBT) models
• Biopsychosocial frameworks
• Attachment-based formulations
• Trauma-informed perspectives

Many therapists use an integrative approach, combining elements from different models.

The Step-by-Step Process of Case Formulation

Step 1: Gathering Information

The process begins with understanding the client’s experience. This includes:

• presenting difficulties
• emotional experiences
• thoughts and beliefs
• behaviours
• physical symptoms
• life history
• relationships
• current stressors

This stage is not just data collection. It is also about building trust. A strong therapeutic relationship improves both formulation quality and outcomes (Flückiger et al., 2018).

Step 2: Identifying Presenting Problems

Therapists then clarify the main difficulties. These may include:

• anxiety
• low mood
• trauma-related symptoms
• relationship difficulties
• emotional dysregulation

Clarity is important. Broad concerns are gently shaped into specific, understandable patterns.

For example:

“I feel overwhelmed” may become
“I experience persistent worry and physical tension, especially in social situations.”

Step 3: Exploring Predisposing Factors

Predisposing factors are vulnerabilities that may have increased the likelihood of current difficulties. These may include:

• early childhood experiences
• attachment patterns
• temperament
• past trauma
• family environment

For example:

A child who experienced inconsistent caregiving may develop heightened sensitivity to rejection. Research highlights the role of early experiences in shaping emotional regulation and mental health outcomes (McLaughlin, 2016).

Step 4: Identifying Precipitating Factors

Precipitating factors are events or stressors that triggered the current difficulties. These are often recent.

Examples include:

• relationship breakdown
• loss or bereavement
• work stress
• transitions (e.g., becoming a parent)

This step connects past vulnerabilities with present experiences.

Step 5: Understanding Perpetuating Factors

Perpetuating factors are what keep the problem going. This is one of the most important parts of formulation. Examples include:

• avoidance behaviours
• negative thinking patterns
• reassurance-seeking
• emotional suppression
• unhelpful coping strategies

In CBT, these are often mapped into cycles.

For example:

Anxiety → avoidance → temporary relief → increased anxiety

Research shows that identifying maintaining factors is key to effective intervention (Persons, 2012; updated applications continue in recent CBT literature).

Step 6: Identifying Protective Factors

Not all focus is on difficulties. Therapists also explore strengths.

These may include:

• supportive relationships
• coping skills
• personal values
• resilience
• motivation for change

Protective factors are important for building effective interventions. They provide a foundation for progress.

Step 7: Linking the Pieces Together

At this stage, the therapist brings everything together into a coherent understanding. This may be presented as:

• a narrative explanation
• a visual diagram
• a CBT formulation model

A common structure is the 5 Ps model:

• Presenting problems
• Predisposing factors
• Precipitating factors
• Perpetuating factors
• Protective factors

This creates a clear and organised picture.

Step 8: Sharing the Formulation With the Client

Formulation is not something done to the client. It is developed with them. Therapists often share their understanding and invite feedback: “Does this fit your experience?”

This collaborative process:

• increases insight
• builds trust
• improves engagement

Research suggests collaborative formulation enhances therapeutic alliance and outcomes (Johnstone & Dallos, 2014; continued support in recent clinical practice literature).

Step 9: Using the Formulation to Guide Intervention

The formulation directly informs treatment. For example:

• If avoidance maintains anxiety → exposure-based strategies may be used
• If self-criticism is central → compassion-focused techniques may be introduced
• If trauma is key → trauma-focused interventions may be appropriate

This ensures therapy is targeted and evidence-based.

Step 10: Reviewing and Updating the Formulation

Formulation is not fixed. It evolves. As therapy progresses, new insights emerge. The formulation is refined accordingly. This flexibility is essential for effective mental health care.

Example of a Simple Case Formulation

To make this more concrete, here is a simplified example:

Presenting problem:
Social anxiety and avoidance

Predisposing factors:
Early experiences of criticism

Precipitating factor:
Negative experience at work presentation

Perpetuating factors:
Avoidance of social situations, negative self-talk

Protective factors:
Supportive friend, strong motivation to improve

This leads to a treatment focus on:

• reducing avoidance
• challenging negative beliefs
• building confidence gradually

4 Common Models Used in Case Formulation

1. CBT Formulation

Focuses on the interaction between thoughts, emotions, behaviours, and physical sensations. Widely used for anxiety and depression.

2. Biopsychosocial Model

Considers biological, psychological, and social influences. Provides a holistic understanding of mental health.

3. Attachment-Based Formulation

Explores how early relationships influence current patterns. Often used in relational and developmental work.

4. Trauma-Informed Formulation

Focuses on how past trauma shapes current responses. Emphasises safety and regulation.

Why Formulation Is More Helpful Than Diagnosis Alone

Diagnosis can be useful. But it has limitations. It may not explain:

• why symptoms developed
• why they persist
• what will help

Formulation fills this gap. It provides meaning. It also reduces stigma by focusing on understandable processes rather than labels.

Conclusion

Behind every therapy session is a deeper process of understanding. Case formulation is what allows therapists to connect the dots between past experiences, present difficulties, and future change. It turns complexity into clarity. It transforms symptoms into meaning. And most importantly, it ensures that therapy is tailored to the individual, not just the diagnosis. For anyone exploring therapy or working within mental health, understanding case formulation offers valuable insight into how psychological change begins.

References

Flückiger, C., Del Re, A. C., Wampold, B. E., & Horvath, A. O. (2018). The alliance in adult psychotherapy: A meta-analytic synthesis. Psychotherapy, 55(4), 316–340.

Johnstone, L., & Dallos, R. (2014). Formulation in psychology and psychotherapy: Making sense of people’s problems. Routledge.

Kuyken, W., Fothergill, C. D., Musa, M., & Chadwick, P. (2016). The reliability and quality of cognitive case formulation. Behaviour Research and Therapy, 48(12), 1260–1268.

McLaughlin, K. A. (2016). Future directions in childhood adversity and youth mental health. Journal of Clinical Child & Adolescent Psychology, 45(3), 361–382.

Persons, J. B. (2012). The case formulation approach to cognitive-behavior therapy. Guilford Press.

World Health Organization. (2022). World mental health report: Transforming mental health for all. WHO.