The issue examined was whether a multidimensional self- concept assessment device provides helpful diagnostic information for use in making recommendations regarding treatment and placement of adolescent offenders. Other important areas assessed for treatment and placement decisions of adolescent offenders are intelligence (WISC-III) and personality (MMPI). The MMPI is used in this study. Subjects were 22 adolescent males being detained for minor juvenile offenses and waiting for placement outside the home. They ranged in age from 13 to 17, with an average age of 15. The SDQ-II is a 102-item self-report inventory that evaluates academic and general self-concept. The 11 scales are Math, Physical Abilities, Physical Appearance, Honesty-Trustworthiness, Verbal, Emotional Stability, Parent Relations, General School, Same-Sex Relations, and General Self. The 11 scales are summed to yield a total self-concept score. Study results generally support the use of a multidimensional instrument with delinquents to measure self-concept rather than more global measures. Interventions should be targeted according to each juvenile's specific deficits in personality and intelligence areas. Such data can be obtained through comprehensive assessment. Implications for future research are discussed. 2 tables and 37 references