When approached by Plenum to put together a volume of social science research on the topic of youth and justice I found the interdisciplinary challenge of such a project intriguing. Having spent 2 years as Director of the Law and Social Science Program at the National Science Foundation I was well aware of the rich diversity of research that could fit within that topic. I also knew that excellent research on youth and justice was coming from different communities of researchers who often were isolated from each other in their respective disciplines as psychologists sociologists criminologists or policy analysts. I saw this project as an opportunity to break down some of this isolation by introducing these researchers-and their work-to each other and to the broader community of social scientists interested in law and justice. There was another gap or set of gaps to be bridged as well. The juvenile justice system and the criminal justice system differ in significant ways and the civil justice system which is a major venue for issues of youth and justice is yet another separate world. Few researchers are likely to know the whole picture. For example a focus on juvenile justice often ignores the extent to which civil justice proceedings shape the lives of young people through divorce custody adoption family preservation policies and other actions (and vice versa).