How can we use evidence to improve deradicalisation and violence prevention outcomes? Based on work developed during the implementation of the cross-European INDEED project, this is an essential reference book for practitioners, researchers and policy makers. It sets out the three pillars of best evidence-based practice – scientific evidence, professional judgement and consideration of clients’ preferences, values and beliefs. Demonstrating both successful and unsuccessful approaches with case studies from the field, the book offers practical strategies for prevention teams designing and evaluating their programmes.