Source: (2005) Crime & Delinquency. 51(1):26-52.In 1996, California provided funding to 14 county probation agencies to implement multiagency, comprehensive services to keep troubled youths from recommitting crime and progressing farther into the justice system.We report results of a randomized experiment used to evaluate Ventura County’s 4-year demonstration project called the South Oxnard Challenge Project (SOCP).We followed youths for more than 2 years after random assignment to SOCP or routine probation. We found no significant differences between SOCP and routine juvenile probationers on recidivism or other official-record outcomes. Although most youths were rearrested, most did not receive a sustained petition or incarceration. The modest additional services did not affect outcomes.