3. If more than one 8-16 year old lives in the home, the one with the greater problem severity will be included in the study. Substance use will be probed ("Have you ever used alcohol or drugs?"). If one youth answers yes, and the other answers no, the one who answers yes will be included. If both child answer "yes", then the Form 90 substance use section [history and current pattern] will be administered to each. The child who reports the more severe pattern and history of use [age of onset, type of drug used, frequency of current use] will be included. If neither youth reports using alcohol or drugs, then the Youth Self-Report (Achenbach & Edelbrock, 1982) will be administered and the youth with the greater total problem score will be included.