BSFT is a brief intervention used to treat adolescent drug use that occurs with other problem behaviors. These co-occurring problem behaviors include conduct problems at home and at school, oppositional behavior, delinquency, associating with antisocial peers, aggressive and violent behavior, and risky sexual behavior. BSFT is based on three basic principles: First, BSFT is a family systems approach. Second, patterns of interaction in the family influence the behavior of each family member. The role of the BSFT counselor is to identify the patterns of family interaction that are associated with the adolescent’s behavior problems. Third, plan interventions that carefully target and provide practical ways to change those patterns of interaction that are directly linked to the adolescent’s drug use and other problem behaviors.