Substance-abusing adolescents experiencing inadequate family structure and functioning will be at a serious disadvantage with regard to recovery. The family support network (FSN) intervention seeks to extend the focus of treatment beyond the world of the adolescent by engaging the family, a major system in his or her life. Designed to increase parental support of a child's recovery, the FSN approach seeks to engage families in the treatment process, improve parents' competence in supporting their child's recovery, and shift therapy from time-limited formal treatment to a support group for parents. The FSN process is a family intervention designed to be used in conjunction with any standard adolescent treatment approach. The procedures presented in this manual combine motivational enhancement and cognitive behavioral therapies as one possible treatment overlay for the adolescent. The motivational enhancement therapy (MET) and cognitive behavioral therapy (CBT) approaches used in the Cannabis Youth Treatment (CYT) study are presented in "Motivational Enhancement Therapy and Cognitive Behavioral Therapy for Adolescent Cannabis Users: 5 Sessions, Cannabis Youth Treatment Series, Volume 1" and "The Motivational Enhancement Therapy and Cognitive Behavioral Therapy Supplement: 7 Sessions of Cognitive Behavioral Therapy for Adolescent Cannabis Users, Cannabis Youth Treatment Series, Volume 2." Thus, while an adolescent is receiving a special MET/CBT program for adolescents, the family is involved in the FSN intervention. This manual guides counselors and therapists, so they can consistently conduct effective case management. The appendixes include quality assurance materials and a detailed account of the CYT study. (Contains 29 references.) (GCP)