Data collection procedures for the first three waves of the study have been reported elsewhere [e.g., Eron et al., 1971; Huesmann et al., 1984, 2002; Lefkowitz et al., 1977]. At age 8, two main sources of data were utilized: classroom-based peer nominations and extensive individual parent interviews. At age 19, participants were administered a variety of self-report measures, as well as peer nominations, in individual interviews at a field office. At ages 30 and 48, interviews were conducted by computer in a field office and by mail/telephone for those participants who could not come to the office. At age 30, participants were paid $50 for their participation; at age 48, they were paid $100 for their participation. Interviews ranged from 2 to 4 hr.
