In 2000 several European academics decided it was time to launch a European Society of Criminology. From the start the new Society encouraged the creation of working groups on specialized topics. One of the first such working groups was focused on “juvenile justice,” launched by the first author of this book. The idea for this book emerged from concerns about recent developments in juvenile justice in our own countries, developments that were leading toward an evermore punitive, but not necessarily more effective, system in juvenile justice. To our surprise numerous Society members specializing in the field of Juvenile Delinquency and Youth Justice shared these sentiments and joined the working group. In addition, some American and Canadian experts became ESC members and were interested in joining the working group, adding an international dim- sion to our undertaking. The working group was guided by several key qu- tions. How have different states developed their juvenile justice system in the last 25 years, and if one compares countries, to what extent are these developments similar or different? To be more precise: to what degree has the Welfare system that had existed for most of the 20th century changed into a Just Desert and more punitive system in these countries? The present book tries to answer these questions for a great number of European and two North American countries in a comparative perspective, including 19 national reports on juvenile justice and