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Alcoholics Anonymous (AA) participation often is of interest in alcoholism treatment research, but few measures of this variable have been developed with known psychometric properties. It is common for measures of AA participation to blur the important distinction between frequency of AA attendance and AA involvement. This study provides psychometric findings for the Alcoholics Anonymous Involvement (AAI) scale, a 13-item self-report inventory that measures lifetime and recent attendance and involvement in AA. Normative data are provided based on a national sample of alcoholic participants in treatment (N = 1, 625), and AAI response stability is reported by using a test–retest sample (N = 76). Findings indicate that the AAI can serve as a reliable and useful instrument for assessing AA attendance and involvement.