Behavioral Experiment Worksheet: Test an Anxious Belief Against Real-World Evidence
Turn an anxious belief into a testable prediction, run a real-world experiment, and let the result update your thinking more powerfully than logic alone ever can.
Reviewed by Michael Callans, MSW 
About this tool
A behavioral experiment is one of the most powerful tools in cognitive behavioral therapy because it changes belief through experience rather than argument. You can often talk yourself part of the way out of an anxious thought, but the conviction tends to return. Running a real test in the world gives your brain direct evidence, which is far more convincing than reasoning on paper.
The method is borrowed from science. You take a belief such as 'if I speak up in the meeting, people will think I'm stupid,' turn it into a specific, measurable prediction, then design an experiment to see whether the prediction holds. You note what you expect to happen and how strongly you believe it, run the experiment, and record what actually occurred. Most of the time the feared outcome is milder or rarer than predicted, and that gap is where learning happens.
Good experiments are specific and safe. Choose a prediction you can actually check, keep the first one small, and drop safety behaviors that would muddy the result, like over-rehearsing or only half-trying. The goal is not to prove yourself wrong but to gather honest data, then write down clearly what you learned so the new belief sticks.
Behavioral experiments pair naturally with thought records. A thought record helps you identify the belief and weigh existing evidence; a behavioral experiment generates fresh evidence in the real world. Used together over time, they steadily loosen the grip of anxious predictions that have never actually been tested.
Behavioral experiments were formalized as a distinct CBT technique in Bennett-Levy and colleagues' 2004 Oxford Guide to Behavioural Experiments in Cognitive Therapy, building on Aaron Beck's original cognitive therapy model, which held that testing a belief against real experience changes it more durably than debating it in your head. That distinction, between believing something is probably false and knowing it from direct evidence, is why clinicians treat behavioral experiments as central to CBT for anxiety, social fears, and health-related worry.
A single experiment rarely settles a belief for good. Run the same kind of test a few times in different situations before you expect the belief rating to shift much, and expect some results to be mixed rather than a clean disproof. If your predictions keep coming true, if the belief feels too dangerous to test even in a small way, or if anxiety is interfering with daily life, that is a sign to work through this with a licensed therapist rather than alone. You can search the Psychology.com therapist directory for a CBT-trained clinician who can help you design experiments that are safe and well matched to what you are working on.
References
- Bennett-Levy J, et al. Oxford Guide to Behavioural Experiments in Cognitive Therapy. Oxford University Press; 2004.
- Beck JS. Cognitive Behavior Therapy: Basics and Beyond. 2nd ed. Guilford Press; 2011.
Cite this source
Psychology.com. (2026, September 14). Behavioral Experiment Worksheet. Psychology.com. https://psychology.com/tools/behavioral-experiment
Behavioral Experiment Worksheet FAQ
What is a behavioral experiment in CBT?
It is a planned, real-world test of an anxious or unhelpful belief. You turn the belief into a prediction, design a safe way to check it, then compare what actually happens to what you expected. The result updates the belief through direct experience.
How is this different from a thought record?
A thought record weighs the evidence you already have for a thought. A behavioral experiment creates new evidence by testing the thought in the real world, which is often more convincing than reasoning alone.
What if my prediction comes true?
That still gives you useful data. Most feared outcomes are milder or more manageable than expected, and even a confirmed prediction shows you can cope. Treat every result as information, not a verdict on you.
Is my information saved?
No. Everything stays in your browser. Your entries are never uploaded or stored, and the PDF is generated on your own device.
Is the behavioral experiment worksheet free to use?
Yes. The worksheet, the prediction and outcome fields, and the PDF download are free with no account or sign-up required. Your entries stay in your browser and are not uploaded anywhere, so you can use it as often as you like.
How often should I do a behavioral experiment?
There is no fixed schedule. Many people run one per belief per week, since it takes time to plan a fair test, follow through, and reflect on the result. Spacing them out also gives you room to try a slightly bigger experiment once a smaller one goes well.