This document is one of seven publications contained in a series of materials for physicians on recognizing, intervening with, and treating adolescent alcoholism. The materials in this unit of study offer guidelines to help physicians make responsible and informed decisions about their roles with adolescent patients. Materials are presented which can help physicians to: (1) identify levels of prevention regarding use and abuse of alcohol and other substances; (2) describe fundamental steps which may be taken by physicians in addressing teenage alcoholism at each level of prevention; (3) demonstrate an understanding of the terms host, agent, and environment as they apply to the problem of teenage alcoholism; (4) discuss methods of prevention in terms of agents, hosts, and environment, given the level of prevention to be undertaken; (5) conceptualize the role to be taken personally in relationship to adolescent patients, given each level of participation; (6) clarify personal preventive activities in terms of the specific roles of advocate, educator, counselor, community change agent, and early case finder; (7) prepare a personal prevention program which identifies appropriate persons and agencies with whom to cooperate; and (8) demonstrate a thorough knowledge of local and regional consultative and referral sources for treatment of adolescents with chemical abuse problems. (NB)