Behavioural Experiment Worksheet

When to Use

Use when the client has identified a specific negative prediction or belief that can be tested through direct experience. Central to CBT for depression, particularly for testing hopelessness predictions and beliefs about competence or pleasure. Most effective when linked directly to the formulation.

How to Introduce

Position as a scientific test: 'Rather than just talking about whether this thought is accurate, let's design an experiment to find out. Like a scientist, we'll make a prediction, run the test, and see what actually happens. Whatever the result, we learn something useful.'

Adaptations

Start with lower-stakes experiments for clients with low confidence. For those with severe hopelessness, choose experiments with a high likelihood of at least partial disconfirmation to build momentum. Ensure experiments are specific and measurable to avoid ambiguous results.

Avoid designing experiments that could genuinely reinforce negative beliefs if they go wrong. Not appropriate if the client lacks the motivation or functional capacity to carry out the experiment between sessions. Ensure the experiment tests the belief, not the client's worth.

Clinical Tips

The most common pitfall is vague predictions; ensure the client specifies exactly what they expect to happen, including a percentage rating. Plan for all possible outcomes, including partial confirmation, so every result yields learning. Review the outcome in detail at the next session and update the belief rating.