Adolescent alcohol use is prominent among today's teens and has elicited rising concerns among parents, health practitioners, social policymakers, and the public at large. Yet there is an absence of a relatively concise book that summarizes and integrates existing knowledge on the various facets of adolescent alcohol use. This book attempts to fill this void by integrating research from the multiple fields of study (e.g., prevalence of use), describing measurement approaches (e.g., survey and clinical diagnostic), reviewing risk and protective factors, reporting on findings from prominent prevention and treatment studies, and suggesting future research directions. The coverage is intended to examine issues relevant to etiology, developmental courses, and prevention and treatment, as well as to identify future research directions.