Factor analysis revealed three dimensions of delinquency, labeled crime, school opposition, and covert antisocial behavior. The delinquent behaviors under investigation were described through the concepts of variety, frequency, and participation. Respondents who reported participating in a variety of delinquent activities tended to have more frequent police contacts than other juveniles. There were clear age-related patterns in school opposition and covert behavior, as well as tendencies for peak ages to occur in self-reported crime. Sex differences were most pronounced on the crime dimension, significant but less extreme in terms of school opposition, and insignificant with regard to participation in covert behavior. 3 tables, 6 figures, 1 appendix, and 49 references