Adolescence is a distinct, yet transient, period of development between childhood and adulthood characterized by increased experimentation and risk-taking, a tendency to discount long-term consequences, and heightened sensitivity to peers and other social influences. A key function of adolescence is developing an integrated sense of self, including individualization, separation from parents, and personal identity. Experimentation and novelty-seeking behavior, such as alcohol and drug use, unsafe sex, and reckless driving, are thought to serve a number of adaptive functions despite their risks. Research indicates that for most youth, the period of risky experimentation does not extend beyond adolescence, ceasing as identity becomes settled with maturity. Much adolescent involvement in criminal activity is part of the normal developmental process of identity formation and most adolescents will mature out of these tendencies. Evidence of significant changes in brain structure and function during adolescence strongly suggests that these cognitive tendencies characteristic of adolescents are associated with biological immaturity of the brain and with an imbalance among developing brain systems. This imbalance model implies dual systems: one involved in cognitive and behavioral control and one involved in socio-emotional processes. Accordingly adolescents lack mature capacity for self-regulations because the brain system that influences pleasure-seeking and emotional reactivity develops more rapidly than the brain system that supports self-control. This knowledge of adolescent development has underscored important differences between adults and adolescents with direct bearing on the design and operation of the justice system, raising doubts about the core assumptions driving the criminalization of juvenile justice policy in the late decades of the 20th century. It was in this context that the Office of Juvenile Justice and Delinquency Prevention (OJJDP) asked the National Research Council to convene a committee to conduct a study of juvenile justice reform. The goal of Reforming Juvenile Justice: A Developmental Approach was to review recent advances in behavioral and neuroscience research and draw out the implications of this knowledge for juvenile justice reform, to assess the new generation of reform activities occurring in the United States, and to assess the performance of OJJDP in carrying out its statutory mission as well as its potential role in supporting scientifically based reform efforts.

This report documents the changes sweeping across the Nation in the handling of serious and violent juvenile offenders. All legislation enacted in 1992-95 that targeted violent or other serious crime by juveniles was analyzed to determine common themes and trends. Telephone surveys of juvenile justice practitioners in every State provided anecdotal information about substantive and procedural changes that have occurred as a result of the new laws. This report presents a compilation of these changes, an analysis of the direction of those changes &, where appropriate, a historical perspective. Charts and tables.

Changes in juvenile law and juvenile court procedure are slowly dismantling the jurisdictional border between juvenile and criminal justice. Juvenile courts across the United States are increasingly similar to criminal courts in their method as well as in their general atmosphere. State and Federal laws are being changed to send a growing number of young offenders to criminal court where they can be tried as if they were adults. The two court systems appear to be moving toward complete convergence. Policymakers and practitioners need to be aware of the factors leading to this convergence and they should understand the effects it may have on offenders, victims, and the general community. This discssion reviews the origins of juvenile justice in the United States, summarizes the legislative and policy changes that are effectively dismantling the juvenile-criminal border, and examines research on the impact of such policies. The discussion concludes with a review of issues that should be prominent in any debate about the future viability of the juvenile-criminal boundary.