How to systematically make use of behaviour change theory and evidence in designing public policy? Can behavioural diagnosis help to identify key determinants and effective strategies? How to develop, adapt and evaluate interventions in a behaviour change theory - and evidence- based manner? What are the steps to take forward to improve the uptake and use of research on influencing behaviour, when designing policies and interventions? Welcome to an open symposium tackling these issues! A high-profile multidisciplinary 2-day symposium will feature international and Finnish speakers. All scholars, students and audiences interested in the behaviour change research and policy are welcome to discuss and seek novel promising avenues for the future!