The overriding purpose of the randomized trial is to examine the effectiveness of a promising and efficient outpatient treatment of adolescent substance abuse delivered in a community-based treatment setting. Although several evidence-based treatments of adolescent substance abuse are emerging, none have experienced widespread adoption in community settings. Thus, as noted by the Institute of Medicine (1998) more than a decade ago and reiterated more recently, a considerable science-service gap exists in regards to treatment of substance abuse in adolescents and adults.