This volume examines the research and theoretical bases for the creation of a risk-needs management instrument for violent adolescents and young adults. The proposed instrument includes risk indicators beginning prenatally, pari-natally, at birth, then through infancy, early childhood, middle childhood and, finally, adolescence. The main purpose of the instrument is to assist case managers responsible for providing positive interventions to families and children, at all childhood and adolescent life stages, in order to reduce the likelihood of violent behaviours. The case intervention strategy is based on the assumption that the earlier resources are provided, the more effective they will be. The data instrument will be structured so that the risk information is gathered cumulatively across age domains and can be used to match specific interventions with particular needs profiles of a family and child, adolescent or young adult. The first part of this book contains 23 original chapters from many of the leading researchers on violence risk-needs indicators, such as David Farrington and Fredrick Losel. The second part of the book provides an elaborated conceptual framework that will be the basis for the creation of the risk-needs instrument. This book should be of interest to researchers, policy makers and government and non-government agency workers who are involved with policies, programmes and instruments focused on the prevention of youth and young adult violence. It can be used as an advanced textbook in upper level undergraduate courses and graduate courses in psychology, criminology, social work and educational counselling which deal with the child and youth violence, especially its causes and preventive interventions.