Racine, Wis., has all the dynamics of an urban area such that the members of the cohort can be expected to be subjected to the same influences as persons growing up in urban areas. From those who reported delinquent behavior in their juvenile years, there was no pattern or link associated with the adoption of an adult criminal career. Where adult criminal careers did exist, there was no consistent pattern of juvenile behavior. Formal contact with the criminal justice system as a juvenile was also identified as a possible factor that may increase the possibility of adult criminal involvement. The implications of the findings for predicting criminality are discussed.