Evaluating impact is essential for ensuring behavioural science (BeSci) drives meaningful, evidence-based change. In this session, colleagues from UNDP, WHO Europe and the World Bank will share practical insights, including successes, challenges, and lessons learned from conducting impact evaluations when applying behavioural science. This webinar aims to equip participants with knowledge about how to start designing evaluations and translating findings into meaningful policy and programme improvements - demonstrating the value of behavioural science.