The Handbook of Youth Prevention Science describes current research and practice in mental health preventive interventions for youth. Traditional prevention research focused on preventing specific disorders, e.g. substance abuse, conduct disorders, or criminality. This produced "silos" of isolated knowledge about the prevention of individual disorders without acknowledging the overlapping goals, strategies, and impacts of prevention programs. This Handbook reflects current research and practice by organizing prevention science around comprehensive systems that reach across all disorders and all institutions within a community. Throughout the book, preventive interventions are seen as complementary components of effective mental health programs, not as replacements for therapeutic interventions. This book is suitable for researchers, instructors and graduate students in the child and adolescent mental health professions: school psychology, school counseling, special education, school social work, child clinical psychology and the libraries serving them. It is also suitable for graduate course work in these fields.