This book examines the processes for social integration and social cohesion among young people, drawing on data collected from the International Self-Report Delinquency (ISRD) study, which covered 35 studies.This report examines case studies from 5 selected countries (France, Germany, the Netherlands, the United Kingdom, and the United States) to provide an in-depth comparative study. Social integration processes are defined by sociologists as the mechanisms through which a society is held together, and populations are transformed into collectivities and communities. They are understood by criminologists to be an important factor in crime prevention, and factors such as peer groups and families are strong determinants of criminal behavior. In a time when society, and particularly young people, can seem increasingly fragmented (due to new technologies, rapidly increasing migration, economic inequality, and increased individuation), the researchers in this volume seek to understand whether and how these phenomena affect young people, and how they may have an impact on the development of criminal and antisocial behavior. This work will provide a framework for researchers in criminology and criminal justice, particularly with an interest in juveniles, developmental criminology, and crime prevention, as well as related fields such as sociology, social work, and demography.