This study compared the Type A tendencies reported on the Behavior Activity Profile questionnaire and those yielded by a taped-voice analysis of 34 male prison inmates convicted for a variety of violent offenses. The primary objective was to provide prison officials with an instrument for detecting repeated assaulters from nonassaulters. The secondary objective was to determine which of the two Type A assessment techniques was more predictive of prisoners' status as assaulters. The multivariate analysis indicated that the profile, prisoners' length of sentence, and number of convictions accounted for 88% of the variance in grouping, assaulter or nonassaulter. Implications for prison administrators and researchers were discussed.