This book brings together the latest literature and European experiences on preventing youth violent radicalisation and violent actions in intergroup relations. Youth violent radicalisation is a significant problem within the European context, and requires an exploration of how various social actors can play an active role in preventing radicalisation in minors and young adults. This complex issue needs to be explored through a multidisciplinary approach, and effective operational models are needed in order to tackle it. This book describes the theoretical framework for such an approach in all its facets. The book's originality lies in its psychosocial and participatory approach, aimed at improving results through professional training and community empowerment for building trusting relationships and educational activities. It also proposes "alternative narratives", which are a way of representing people and groups within a social context, thereby overcoming stereotyped visions and stigma. This book focuses on participation and communication among stakeholders, social inclusion, strengthening democratic values, and pursuing a proactive instead of a reactive approach to preventing radicalisation. Highly topical, the book will appeal to researchers and students of the social and behavioural sciences interested in youth radicalisation, including social work and social policy, as well as practitioners working within the juvenile justice system.