The study collected data on 411 male juveniles from 1961 through 1981. The sample was taken from a population of male children in a working class urban area. The major part of the sample was selected by taking all boys aged 8 to 9 who were on the registers of six state primary schools located within a 1 mile radius of the research office. Variables pertained to socioeconomic conditions, schooling, friendships, parent-child relationships, extracurricular activities, school records, and criminal records. Psychological tests were performed on the subjects to determine factors in delinquency. Data also encompass child-rearing behavior, job histories, leisure habits, popularity, physical attributes, tendencies toward violence, sexual activity, and self-reported delinquency. A 51-item bibliography of publications from the study.