The original CBCL (Achenbach & Edelbrock, 1981) contains 113 items which load on 9 main scales. Parents and peers answered questions regarding the target adolescents’ behavior on the externalizing scales: aggression, hostility, delinquency, hyperactivity, and immaturity. For this study, the short forms taken from Lizotte, Chard-Wierschem, Loeber, & Stern (1992) were used.
Originally developed as an open-ended interview, a modified rating form was administered to adolescents and their peers (Elliot & Ageton, 1980). The modified version uses the following scale for each item (in the past 6 months): “How often have you…” Never, Once or Twice, 3 or 4 Times, Once a Month, 2-3 Times a Month, Once a Week, 2-3 Times a Week, Once a Day.
The YSR is designed to obtain adolescent reports of their own competencies and problems in a standardized format. The original form (Achenbach, 1991) contained 112 items divided into 9 major scales. For this study, the short form for both the externalizing scale (aggressive behavior, delinquent behavior, hostile/withdrawn, and hyperactive) and immaturity scale were used.