By Dr Melody Smith, Clinical Psychologist
If you are working towards an Assistant Psychologist role or preparing for clinical psychology training, you will probably encounter the 5 Ps formulation sooner or later. It looks deceptively simple: five headings that help us organise information about somebody’s difficulties. Yet formulation is about much more than remembering what each P stands for. It asks us to move from collecting information to making psychological sense of it — and that shift can be surprisingly difficult. In fact, the part that makes a formulation genuinely useful is often the part aspiring psychologists miss.
A psychological formulation is best understood as a developing hypothesis rather than a definitive explanation. It brings together what we have learned through assessment and considers how different biological, psychological, relational and social factors might connect. Importantly, formulation should help us think about what might be useful next. The 5 Ps provide one accessible framework for beginning that process (Copello et al., 2016).
What is the 5 Ps formulation?
The five areas are presenting, predisposing, precipitating, perpetuating and protective factors. Although separating information in this way can initially be helpful, the aim is eventually to understand the relationships between those areas.
Presenting: what is happening now?
Start with the difficulties bringing the person into contact with a service.
This should extend beyond a diagnostic label. Someone referred because of anxiety, for example, might also describe difficulty sleeping, withdrawing from friends, struggling at work and worrying about their relationships.
Try asking yourself: What is difficult for this person, in their own terms? What has changed? How is this affecting their everyday life?
Beginning with the person’s account helps prevent formulation becoming something professionals construct about somebody rather than with them.
Predisposing: what might have increased vulnerability?
Predisposing factors consider experiences or circumstances that may have made the current difficulties more likely to develop.
These could include developmental experiences, relationships, physical health, previous adversity, socioeconomic circumstances, discrimination, learning experiences or biological vulnerabilities. They are possibilities rather than proof of causation.
This distinction matters. If someone experienced childhood adversity and now experiences depression, we cannot simply conclude that one caused the other. Formulation requires thoughtful connections supported by the available information, psychological theory and the person’s understanding of their experience.
Precipitating: why now?
This is often one of the most useful questions in formulation.
What happened around the time the difficulties developed or intensified?
Perhaps there was a bereavement, relationship breakdown, transition, workplace difficulty, physical illness, financial pressure or accumulation of several stresses. Sometimes there will be an obvious trigger; sometimes there will not.
The temptation is to make the story fit neatly. Resist it. Good formulation leaves room for uncertainty.
Perpetuating: what might be keeping things going?
For aspiring psychologists, this is a particularly important P because perpetuating factors can begin to point towards intervention.
Imagine someone becomes anxious about making mistakes at work. They begin repeatedly checking everything they do. Checking temporarily reduces their anxiety, so they check more. Over time, they have fewer opportunities to discover that they can tolerate uncertainty without checking.
The behaviour makes sense: it provides short-term relief. Yet it may also contribute to the longer-term cycle.
Perpetuating factors can be individual, interpersonal, organisational or societal. Consider behaviour, beliefs, relationships, environmental pressures, access to resources and responses from services rather than searching only within the person.
Protective: what is already helping?
This P deserves far more attention than it sometimes receives.
Protective factors include strengths, relationships, resources, values, coping strategies, previous resilience, interests, community connections and experiences of successfully managing difficulties.
Research and contemporary formulation guidance increasingly emphasise the importance of including strengths and sociocultural context rather than producing formulations dominated by problems and deficits (Dudley et al., 2011; Thrower et al., 2024a).
Ask: What has prevented things from becoming worse? Who or what helps? What matters to this person? What abilities have they already demonstrated?
Those questions can substantially change the story your formulation tells.
The important bit: connect the Ps
A weak 5 Ps formulation can become five lists.
A stronger formulation tells a tentative psychological story.
For example: an earlier experience might contribute to a particular belief; a recent event might activate that belief; the person understandably responds in a particular way; that response brings short-term relief but unintentionally keeps the difficulty going; meanwhile, certain relationships or strengths interrupt the cycle.
The information may overlap between Ps, and that is fine. The handbook explicitly cautions against becoming preoccupied with putting every detail into the “right” category. The formulation needs to make sense, remain clinically useful and evolve as new information appears (Copello et al., 2016).
That final point is important because formulation is imperfect. A systematic review found considerable variability in agreement between clinicians, suggesting that formulation should not be treated as objective fact (Flinn et al., 2015). More recent research similarly emphasises collaboration, personal meaning, strengths and sociocultural context (Thrower et al., 2024a, 2024b).
Formulation is something you do with people
Perhaps the biggest developmental step is moving away from asking, “Have I got the formulation right?”
Try asking instead: “Is this understandable? Does it fit the information we currently have? Does it make sense to the person? What might we be missing? And does it help us decide what to explore or do next?”
Collaborative formulation itself requires care. A recent qualitative systematic review found that people can experience formulation as useful but also difficult or distressing. Preparing people for the process, keeping formulations accessible, adapting to individual needs and actively involving the person can support collaboration (Thrower et al., 2024a).
That is a much richer clinical skill than memorising five definitions.
Learning the 5 Ps gives you a structure. Developing as an aspiring clinical psychologist means learning when to question that structure, how to hold uncertainty and how to build a formulation collaboratively rather than imposing one. Practise noticing connections, alternatives, strengths and context whenever you encounter a clinical scenario. You do not need to produce the cleverest psychological explanation in the room. You need to demonstrate curiosity, compassion and disciplined thinking — and recognise that your first formulation should rarely be your last.
References
Chadwick, P., Williams, C., & Mackenzie, J. (2003). Impact of case formulation in cognitive behaviour therapy for psychosis. Behaviour Research and Therapy, 41(6), 671–680. https://doi.org/10.1016/S0005-7967(02)00033-5
Copello, A., Mahmood, M., & Day, E. (2016). Alcohol and other drug problems. In A. Carr & M. McNulty (Eds.), The handbook of adult clinical psychology: An evidence-based practice approach (2nd ed., pp. 791–848). Routledge.
Dudley, R., Kuyken, W., & Padesky, C. A. (2011). Disorder specific and trans-diagnostic case conceptualisation. Clinical Psychology Review, 31(2), 213–224. https://doi.org/10.1016/j.cpr.2010.07.005
Flinn, L., Braham, L., & das Nair, R. (2015). How reliable are case formulations? A systematic literature review. British Journal of Clinical Psychology, 54(3), 266–290. https://doi.org/10.1111/bjc.12073
Thrower, N. E., Berry, K., Johnston, I., & Morris, L. (2024a). Understanding the factors that contribute to creating a collaborative psychological formulation: A qualitative systematic review. Clinical Psychology & Psychotherapy, 31(3), e2998. https://doi.org/10.1002/cpp.2998
Thrower, N. E., Bucci, S., Morris, L., & Berry, K. (2024b). The key components of a clinical psychology formulation: A consensus study. British Journal of Clinical Psychology, 63(2), 213–226. https://doi.org/10.1111/bjc.12455
Disclaimer
This blog is intended for educational and reflective purposes only and does not constitute psychological, medical or legal advice. The views discussed are designed to encourage thoughtful reflection and professional development among aspiring clinical psychologists. Readers are encouraged to engage critically, utilise ACPsych Hub resources at aspiringclinicalpsych.org, seek supervision where appropriate, and refer to current professional guidance and evidence-based practice standards.
