Cognitive Analytic Therapy (CAT): How It Works and Who It Helps

Many people seeking therapy know that something keeps going wrong in the same way, the same kinds of relationship difficulties, the same feelings of being stuck, the same self-defeating patterns, but they struggle to understand why. Cognitive analytic therapy (CAT) was designed to address exactly this. Developed by Anthony Ryle in the 1980s within the NHS, CAT is an integrative approach that brings together ideas from cognitive therapy and psychodynamic thinking to help people understand and change the deeply rooted patterns that maintain their difficulties.

Rather than focusing on symptoms alone, CAT explores how the ways you learned to relate to yourself and others in early life continue to shape your experiences today. It is a collaborative, time-limited therapy that gives you concrete tools, including written reformulations and visual diagrams, to recognise your patterns and begin doing things differently.

What is cognitive analytic therapy?

Cognitive analytic therapy is an integrative therapy, meaning it draws on more than one psychological tradition. It combines the practical, structured emphasis of cognitive approaches with the relational depth of psychodynamic therapy. The result is an approach that is both insightful and action-oriented: it helps you understand where your difficulties come from and gives you a framework for changing them.

CAT is time-limited, typically lasting between 16 and 24 sessions. Having a clear beginning, middle and end creates focus and momentum, and the ending itself becomes a meaningful part of the therapeutic process, particularly for people who have struggled with endings or loss in the past.

At the heart of CAT is the concept of reciprocal roles, the paired relational positions that we learn through early relationships and carry into adult life. For example, someone who grew up with a highly critical parent may have internalised a “criticising to criticised” pattern, alternating between harsh self-judgement and feeling judged by others. These patterns were often adaptive in childhood but can become rigid and unhelpful over time.

CAT identifies three specific types of problematic pattern that keep people stuck:

• Traps are self-reinforcing cycles in which an unhelpful belief leads to behaviour that confirms the original belief. For instance, believing “I must please everyone to be accepted” leads to over-giving, which causes exhaustion and resentment, which reinforces the idea that relationships are burdensome.
• Dilemmas are false either/or choices, such as “either I put others first and lose myself, or I put myself first and end up alone,” leaving little room for a balanced middle ground.
• Snags occur when progress towards a goal is unconsciously undermined, often because change feels threatening or disloyal. Someone might begin to assert their needs but pull back because success triggers guilt.

Naming these patterns precisely is one of the reasons CAT can produce meaningful change within a relatively short timeframe.

How does CAT work?

CAT follows a clear three-phase structure, each with a distinct purpose, providing both therapist and client with a shared roadmap for the work.

The reformulation phase (sessions 1 to 4)

The opening sessions are devoted to exploration and reformulation. Together with your psychologist, you will discuss your early experiences, your current difficulties and the patterns you notice repeating across different areas of your life. The aim is to build a shared understanding of how your difficulties developed and what keeps them going.

Around session four or five, your psychologist will share a reformulation letter. This is a carefully written letter addressed directly to you that tells the story of how your patterns formed, drawing on what you have shared about your history and your present-day struggles. It is written in a compassionate, non-judgemental tone and aims to make sense of your difficulties in a way that feels both accurate and validating. Many people describe this letter as a turning point, the moment when patterns that have caused years of confusion begin to feel understandable.

Alongside the letter, you and your psychologist will develop the sequential diagrammatic reformulation (SDR), a visual map of your relational patterns. It shows the reciprocal roles you tend to occupy, the traps, dilemmas and snags that keep you stuck, and the connections between them. The SDR makes your patterns visible in a way that words alone often cannot, and clients frequently describe it as a revelation.

The recognition and revision phase (middle sessions)

With your reformulation tools in place, the middle phase of CAT focuses on two tasks: recognising your patterns as they arise in daily life and beginning to revise them.

Recognition means learning to notice when you are falling into a familiar pattern. You might use rating sheets, diaries or simply your growing awareness to track when your traps, dilemmas or snags appear, with the SDR as a shared reference point.

Revision is the process of experimenting with new ways of responding. The goal is not to eliminate your patterns overnight but to create a gap between the trigger and your habitual response, a space in which you can choose to do something different. Over time, what starts as effortful recognition becomes more natural.

Your psychologist will also pay attention to how your relational patterns show up within the therapy relationship itself. If you tend to take a compliant role to avoid conflict, for example, this might emerge as always agreeing with suggestions. Naming these moments, without judgement, creates a live opportunity for change.

The ending phase (final sessions)

The final three to four sessions focus on reviewing your progress, consolidating what you have learned and preparing to continue the work independently. A distinctive feature of this phase is the exchange of goodbye letters. Both you and your psychologist write a letter reflecting on the therapy, what has changed, what remains and what you are taking forward.

The goodbye letter process is not simply a closing ritual. For many people, endings have been difficult or poorly managed in the past, and the structured, mutual ending of CAT provides an opportunity to experience separation in a healthier way, with awareness and intention rather than old patterns of avoidance or distress.

Who can benefit from CAT?

CAT is suitable for a wide range of psychological difficulties, but it is particularly well matched to people whose struggles are relational in nature. If you notice that your difficulties follow recurring themes, or if similar problems keep appearing across different relationships and situations, CAT may be especially helpful.

Common presentations that respond well to CAT include:

• Depression, particularly when it is linked to patterns of self-criticism, people-pleasing or difficulty asserting your own needs
• Anxiety, especially when rooted in relational dynamics such as fear of rejection, excessive responsibility for others, or a need for approval
• Low self-esteem and a persistent sense of not being good enough, often connected to early experiences of conditional acceptance or criticism
• Difficulties with emotion regulation and relationships, where CAT is one of the recommended structured therapies
• Self-harm and self-destructive behaviours, which CAT understands as part of broader relational and coping patterns
• Eating difficulties, particularly when they are connected to issues of control, self-worth or relational stress
• Relationship problems, including recurring patterns of conflict, withdrawal or difficulty with boundaries

CAT is also well suited to people who have tried more symptom-focused approaches and found them helpful in the short term but not lasting. If your difficulties feel as though they go deeper than specific symptoms, CAT offers an opportunity to understand and address the underlying patterns.

What to expect from CAT sessions

CAT is a genuinely collaborative therapy. From the very first session, you are an active partner in the work, not a passive recipient. The reformulation, the diagram and the understanding of your patterns are all co-created with your psychologist. This collaborative stance is central to the model and is one of the things that many clients value most.

Sessions are typically held weekly and last 50 minutes. You will be asked to reflect on your experiences between sessions, and you may use diaries or pattern-tracking sheets to support this. The reformulation letter and SDR diagram will be shared with you to revisit in your own time, and many people find it helpful to return to these tools long after therapy has ended.

The therapeutic relationship itself is an important part of the work. Your psychologist will be attentive to how your patterns play out in the room and will name these moments openly and compassionately. This is not about catching you out; it is about giving you a live experience of doing things differently within a safe, boundaried relationship. Because CAT has a clear structure and a defined ending, many people find it containing rather than overwhelming, which can be especially reassuring if you have felt directionless in previous therapy experiences.

The evidence base for CAT

CAT has a solid and growing evidence base. The approach was developed and initially evaluated within the NHS, and it continues to be widely used in NHS mental health services across the United Kingdom.

Randomised controlled trials have demonstrated the effectiveness of CAT for people who experience longstanding difficulties with emotions and relationships (what services have traditionally diagnosed as ‘borderline personality disorder’), where it has been shown to reduce self-harm, improve interpersonal functioning and produce clinically meaningful symptom change. Research has also supported the use of CAT for depression, eating disorders and complex presentations involving multiple overlapping difficulties.

NICE recognises CAT within its guidance for these difficulties (the guidance it titles ‘borderline personality disorder’), listing it as a structured psychological therapy that should be considered. The approach is also recommended in various NHS trust clinical guidelines for complex presentations where purely symptom-focused therapies may be insufficient.

A particular strength of the evidence base is its focus on real-world clinical settings. Much of the research has been conducted in routine NHS practice rather than highly controlled research environments, giving confidence that the positive outcomes translate to everyday clinical work. Studies into the specific mechanisms of CAT also suggest that the process of creating a shared reformulation is itself therapeutic, with clients who develop a clear understanding of their patterns showing greater engagement and better outcomes.

CAT vs CBT

Both cognitive analytic therapy and cognitive behavioural therapy (CBT) are evidence-based and structured, but they differ in focus, method and scope.

CBT is primarily concerned with the relationship between thoughts, feelings and behaviours in the present. It identifies unhelpful thinking patterns and tests them through behavioural experiments, thought records and structured techniques. It is highly effective for many difficulties, including anxiety and depression, and is often the first-line recommendation.

CAT takes a broader and more relational view. Rather than focusing on specific thought patterns, it asks how your way of relating to yourself and others developed and how those relational patterns maintain your current difficulties. Where CBT might work on a specific belief such as “I am going to fail,” CAT would explore the relational context in which that belief was formed and map out the wider pattern of roles and responses that flows from it.

The tools also differ. CBT uses thought records, behavioural experiments and graded exposure. CAT uses reformulation letters, sequential diagrammatic reformulation and goodbye letters. CBT tools are designed to challenge and modify specific cognitions, while CAT tools are designed to make relational patterns visible so that you can recognise and revise them.

Neither approach is inherently better. The right choice depends on the nature of your difficulties, your goals for therapy and your personal preferences. If you are unsure which would suit you best, we are always happy to discuss this.

Accessing CAT online

The collaborative, tool-based nature of CAT translates particularly well to online delivery. At The Online Psychologists, cognitive analytic therapy is delivered by HCPC-registered clinical and counselling psychologists with specific training in this approach.

Screen sharing allows your psychologist to develop the SDR diagram with you in real time, and many clients find this even more engaging than working on paper. The diagram can be easily edited, refined and shared digitally. Reformulation letters and goodbye letters are shared securely between sessions, giving you time to read and reflect at your own pace.

The online format also removes practical barriers. CAT-trained psychologists are not available in every area of the country, and online delivery means you can work with an experienced practitioner regardless of your location. For people whose difficulties include anxiety about unfamiliar settings, the comfort of attending from home can make the early sessions feel more manageable.

When you get in touch, we begin with a careful matching process. We consider your presenting difficulties, your goals for therapy and any preferences you have about your psychologist. You can learn more about our approach on our CAT therapy page.

Taking the next step

If you recognise yourself in the patterns described in this article, whether it is repeating the same relational difficulties, feeling caught between extremes, or sensing that your struggles go deeper than the surface, cognitive analytic therapy may offer the clarity and framework you have been looking for.

CAT does not promise to erase your history, but it can help you understand it, see how it shapes your present, and give you the tools to start doing things differently. If you would like to find out whether CAT is right for you, please get in touch. We offer a brief initial conversation to help you understand your options and find the right psychologist for your needs.