This book presents three monographs written by the Formula Grants and Technical Assistance Division of the Office of Juvenile Justice and Delinquency Prevention (OJJDP) in its efforts to assist in the development and implementation of programs to reduce juvenile crime. The book is intended to offer the practitioner a summary of theory and research in juvenile justice, to help clarify funding policies for state and local agencies seeking funding, and to provide OJJDP administrators with criteria for awarding grants and technical assistance. The overall goals and perspectives of the Division are described, suggestions on how to implement goals are presented, and appropriate uses of the Division's technical assistance are explained. For each monograph, a document profile is provided and criteria for technical assistance are described. The first monograph, "Delinquency Prevention," offers a broad perspective on delinquency prevention as it has evolved in the United States. The second monograph, "Alternatives to the Juvenile Justice System," discusses community-based alternatives and considers theories regarding the causes of juvenile delinquency. The final monograph, "Improving the Juvenile Justice System," suggests potential roles for federal, state, and local governments, and for the general public, in improving juvenile justice efforts. (NRB)