The study reports 3-year outcomes for clients who had been treated in the five outpatient sites of Project MATCH, a clinical trial designed to test a priori client treatment matching hypotheses. Client anger demonstrated the most consistent interaction in the trial. A significant matching effect for psychiatric severity that appeared in the first year posttreatment was not observed after 3 years. Of the 21 client attributes used in testing the matching hypotheses, 11 had prognostic value at 3 years. Among these, readiness-to-change and self-efficacy were the strongest predictors of long-term drinking outcome. The reductions in drinking that were observed in the first year after treatment were sustained over the 3-year follow-up period; almost 30 percent of the subjects were totally abstinent in months 37 to 39, and subjects who did report drinking nevertheless remained abstinent an average of two-thirds of the time. Notes, tables, figures, reference