This study was designed to determine whether the Minnesota Multiphasic Personality Inventory could successfully predict the outcome of rehabilitative treatment given 84 racially mixed male alcoholics having a mean age of 42.2 years who were admitted to the Wyoming State Hospital between September 1, 1965, and September 1, 1966. The subjects were given the MMPI before receiving 16 weeks of treatment consisting of education, group and individual psychotherapy, alcoholics anonymous, routine "ward treatment," disulfiram (antibuse), special ward unit, and special program without ward. After their release from hospital, the subjects were evaluated yearly for five years by relatives, employers, and themselves concerning vocational and familial responsibilities, sobriety, AA attendance, and drinking. Multiple regression analysis, a multivariate statistical technique was utilized to analyze the data from a systematic follow-up questionnaire. At the end of five years 32 of the original 84 subjects could be located. The study concluded that the MMPI cannot be used to predict successful treatment of alcoholics at Wyoming State Hospital.