The decade prior to 1994 saw a significant increase in violent juvenile crime, high profile cases of serious and violent crimes committed by juveniles and young adults, and the resulting perception that America was experiencing a juvenile crime wave unlike anything in its history (see Zimring, 1998). Based on the projected growth in the juvenile population during the early twenty-first century, some predicted a coming storm of youth violence (see Welch, Fenwick, & Roberts, 1997) and the emergence of young Asuper-predators@ (DiIulio, 1995). The public, and perhaps even more so policymakers, demanded action. There was a rough consensus among legislators that the juvenile court was too lenient, that serious offenders were beyond rehabilitation and must be incarcerated to ensure public safety, and that juveniles were as culpable for their crimes as adults (Redding, 1997). Thus, states passed legal reforms designed to Aget tough@ on juvenile crime. The most significant change was states= revision of their transfer laws to expand the type of offenses and offenders eligible for transfer from the juvenile court to the adult court for trial and sentencing. Changes also occurred at the federal level with the passage of the Violent Crime Control and Law Enforcement Act of 1994 (Pub. L. 103-332, 108 Stat.1796), which allowed the transfer of 13-year-olds who committed crimes with firearms on federal property. Congressman Bill McCollum, a key sponsor of the federal legislation, said that A[I]n America today, no population poses a greater threat to public safety than juvenile criminals@ (see Lacayo & Donnelly, 1997, p.26). This chapter discusses the research on the general and specific deterrent effects of transferring juveniles for trial in adult criminal court, identifies gaps in our knowledge base that