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This research was designed to evaluate the relative contribution of social norms, demographics, drinking motives, and alcohol expectancies in predicting alcohol consumption and related problems among heavy-drinking college students. Participants included 818 (57.6% women) first-year undergraduates who reported at least one heavy-drinking episode in the previous month. In addition to providing demographic information (gender and fraternity/sorority membership) participants completed Web-based assessments of social norms (perceived descriptive norms regarding typical student drinking, injunctive norms regarding friends' and parents' approval), motives (social, enhancement, coping, and conformity), and expectancies and evaluations of positive and negative alcohol effects. Regression results indicated that descriptive and injunctive norms were among the best predictors of …