This guideline covers recognising and managing antisocial behaviour and conduct disorders in children and young people aged under 19. It aims to improve care by identifying children and young people who are at risk and when interventions can prevent conduct disorders from developing. The guideline also makes recommendations on communication, to help professionals build relationships with children and young people and involve them in their own care. In April 2017, 4 research recommendations were identified as out of date in the surveillance review, and were deleted.