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This paper examines the relative shifts in parent and peer influences on the development of boys' beliefs regarding delinquency from early to middle adolescence. The paper also explores the influence that beliefs about delinquency have on subsequent changes in these social relationships. Structural equation modeling is used to analyze six annual waves of data for 481 boys from the youngest sample of the Pittsburgh Youth Study. Increased parent–adolescent conflict only predicted changes in beliefs about delinquency in early adolescence, while increases in peer delinquency was associated with adopting more tolerant beliefs about delinquent acts from early to middle adolescence. Changes in boys' delinquent peer group association were initially influenced by increased family conflict. However, in middle adolescence increasingly tolerant beliefs about delinquency were related to subsequent increases in delinquent peers. The potential implications for preventing the formation of beliefs favoring delinquency during adolescence are discussed.

The Pittsburgh Youth Study is a prospective longitudinal survey of three samples of Pittsburgh boys (each containing about 500 boys) initially studied in first, fourth, and seventh grades. The first two data collection waves yielded self‐reported delinquency and combined delinquency seriousness scores (the combined scores based on information from boy, mother, and teacher) for the middle sample (up to an average age of 10.7 years) and oldest sample (up to an average age of 13.9 years). These scores were compared with records of petitions to the Allegheny County Juvenile Court for delinquency offenses before and up to six years after the assessments. The area under the ROC curve was used as a measure of validity. Concurrent validity was higher than predictive validity. The combined scale had similar concurrent validity but greater predictive validity than the self‐report scale, and the combined scale also identified a greater number of boys as serious delinquents. Concurrent validity for admitting offenses was higher for Caucasians, but concurrent validity for admitting arrests was higher for African‐Americans. There were no consistent ethnic differences in predictive validity. There was an increase in predictive validity, for both African‐Americans and Caucasians, by combining self‐report data with information from other sources. Afrer controlling for delinquency measures, African‐Americans were more likely than Caucasians to be petitioned in the future, but not in the past. In this research, ethnic differences in official delinquency were partly attributable to ethnic differences in delinquent behavior and were not attributable to differential ethnic attrition or differential ethnic validity of measures of delinquent behavior.

We examine whether gang membership is associated with higher levels of delinquency because boys predisposed to delinquent activity are more likely than others to join. We use 10 years of longitudinal data from 858 participants of the Pittsburgh Youth Study to identify periods before, during and after gang membership. We build on prior research by controlling for ages and calendar time, by better accounting for gang memberships that occurred before the study began, and by using fixed effects statistical models. We find more evidence than has been found in prior studies that boys who join gangs are more delinquent before entering the gang than those who do not join. Even with such selective differences, however, we replicate research showing that drug selling, drug use, violent behaviors and vandalism of property increase significantly when a youth joins a gang. The delinquency of peers appears to be one mechanism of socialization. These findings are clearest in youth self‐reports, but are also evident in reports from parents and teachers on boys' behavior and delinquency. Once we adjust for time trends, we find that the increase in delinquency is temporary, that delinquency falls to pre‐gang levels when boys leave gangs.

We examined the relation between personality traits and crime in two studies. In New Zealand we studied 18‐year‐old males and females from an entire birth cohort. In Pittsburgh we studied an ethnically diverse group of 12‐ and 13‐year‐old boys. In both studies we gathered multiple and independent measures of personality and delinquent involvement. The personality correlates of delinquency were robust in different nations, in different age cohorts, across gender, and across race: greater delinquent participation was associated with a personality configuration characterized by high Negative Emotionality and weak Constraint. We suggest that when Negative Emotionality (the tendency to experience aversive affective states) is accompanied by weak Constraint (difficulty in impulse control), negative emotions may be translated more readily into antisocial acts. We review additional evidence about the developmental origins and consequences of this personality configuration and discuss its implications for theories about antisocial behavior.