Data for the study were taken from the Seattle Youth Study (1981). Questionnaire and interview data were collected from 847 white male respondents. The sample was stratified to obtain a sufficient number of subjects who had police records and youth court records. The study used an index of self-reported delinquency developed by Hirschi (1969). The Seattle Youth Study contained several measures of the nature of relationships between respondents and friends or peers. This study draws a distinction between items assessing the respondent's relationship with a single, best friend and items assessing the respondent's relationship with his friends (or "best friends") in general. The Pearson chi-square and Somers' d statistics are presented to summarize the bivariate relationships between measures of peer delinquency and self-reported delinquency and between measures of attachment to peers and self-reported delinquency. Consistent with prior research and with social learning theory, the study found that measures of peer involvement in delinquency are strongly and positively associated with self-reported delinquency. Measures of attachment to peers are less strongly associated with self-reported delinquency; however, consistent with social control theory, the study found that trust in friends and respect for friends are negatively associated with self-reported delinquency. Measures of attachment to a best friend are not significantly associated with self-reported delinquency. 5 tables and 20 references