The introduction notes that decades of research have revealed that the best juvenile delinquency prevention efforts are those that target risk and protective factors in five areas: individual, community, family, peer group, and school. The report presents crucial findings regarding serious and violent juvenile offenders, the causes and correlates of juvenile delinquency, gangs, and juvenile offenders and victims. It also highlights research efforts related to communitywide responses to juvenile crime, juvenile violence, and juveniles in detention and the conditions of confinement. Emerging research on very young offenders, juvenile court waiver, school violence, strategies to address gangs, female juvenile delinquency, and American Indian juveniles is also discussed. The report also notes that OJJDP, with the help of the researchers, will use what is learned to develop programs and solutions that make a difference to juveniles, their families, and their communities. Section bibliographies; appended lists of grants, interagency and intra-agency agreements, contracts, purchase orders, and OJJDP publications and products from the Research Division from 1994 to the present