Ellis's ABC Model

Cognitive Behaviour Therapy (CBT) for Depression

Cognitive behaviour therapy (CBT) is a structured, time-limited psychological treatment developed principally by Aaron Beck (1979) as a direct application of his cognitive model of depression. It combines two main components: cognitive techniques that directly target negative thinking patterns, and behavioural techniques that aim to break the cycle of withdrawal and inactivity that maintains low mood. CBT is typically delivered over 12–20 weekly sessions with a trained therapist, though it can also be delivered in group format and increasingly through digital platforms.

Cognitive Techniques

The cornerstone of the cognitive component is cognitive restructuring: the identification and systematic challenging of the negative automatic thoughts, cognitive errors, and underlying schemas that maintain the depressive episode. The therapist uses Socratic questioning — a series of guided questions designed to help the client examine the evidence for and against their negative beliefs — rather than simply telling the client that their thoughts are wrong. For example, a client who believes 'No one likes me' might be asked: 'What is the evidence for this belief? Can you think of a recent occasion when someone sought your company? What might an alternative explanation be?' This collaborative, evidence-based process is called guided discovery.

Clients are also taught to identify their specific cognitive errors (overgeneralisation, selective abstraction, etc.) and use thought records (written logs of situations, automatic thoughts, supporting and contradictory evidence, and alternative thoughts) as a self-monitoring and restructuring tool between sessions. Over time, repeated restructuring of specific negative thoughts aims to modify the underlying negative schema.

Behavioural Techniques

Behavioural activation is a key behavioural component derived from the observation that depression leads to withdrawal from activities, which reduces opportunities for positive reinforcement and deepens low mood. The therapist works with the client to schedule increasingly engaging activities — beginning with small, manageable goals — to gradually restore a normal activity pattern and re-expose the client to sources of pleasure and achievement.

Activity monitoring (keeping a detailed log of daily activities and the associated mood ratings) allows therapist and client to identify activities that are associated with better mood and those associated with worse mood. Graded task assignment breaks overwhelming goals into small, achievable steps, building self-efficacy. Behavioural experiments are also used: the client makes a specific prediction based on a negative belief (e.g. 'If I attend the party, everyone will ignore me') and then tests it in real life, using the outcome as evidence to evaluate the belief.

Evaluation

CBT is one of the most comprehensively researched psychological treatments. Meta-analyses consistently show it to be effective for depression — comparable to antidepressant medication in the short term and with evidence of superior relapse prevention in the longer term (Hollon et al., 2005). NICE guidelines recommend CBT as a first-line treatment for mild to moderate depression. However, CBT requires a motivated client who is able and willing to actively engage in the process, complete homework, and reflect on their cognitions — it is less suitable for severely depressed individuals who lack the cognitive or motivational resources to engage. It also does not address biological factors in depression, and access is limited by the shortage of trained CBT therapists in many healthcare systems.