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Thirty-nine male alcoholics in a voluntary outpatient treatment program were interviewed individually on two separate occasions about their social and drinking history. Critical test questions were identical for both interviews but embedded among different filler items. The validity of the subjects's self reports about both alcohol and nonalcohol-related questions was assessed through official records and documents. Self-reports of life history data provided by this group of outpatient alcoholics under specified interview procedures were highly reliable and valid. Differential item reliability and validity were obtained. Further, the value of using the technique of double interviews to predict valid and invalid self-reports is discussed. Suggestions for future research are offered.