This study examined the utility of classifying boys on the basis of a typology of antisocial behavior. A group of 195 boys, aged 10-17, was divided into 4 mutually exclusive groups based on their pattern of antisocial behavior. Stealing and fighting were chosen as criteria to define the 4 groups: A. boys who fought but did not steal, B. boys who stole but did not fight, C. boys who stole and fought, and D. boys who did neither. A multi-method-multirespondent study of these boys showed that the Exclusive Fighter Group tended to score high on a range of overt antisocial behaviors and were relatively little involved in delinquence, the Exclusive Theft group tended to score hgh on some overt antisocial behaviors and were much involved in delinquency, and Versatile Antisocial youths scored highest among all groups on almost all overt and covert antisocial behaviors and in terms of delinquent acts. The Versatile boys came from families with the most disturbed child-rearing practices.