A total of 121 juvenile offenders assigned to a regional assessment center in Medicine Hat, Alberta, Canada, between 1979 and 1984 were administered a test battery. The tests included the WISC-R, an intelligence test for children and adolescents; the MMPI, an objective inventory of psychopathology; and the Rorschach test, a psychodiagnostic test in which participants provide verbal descriptions of a standard series of 10 printed inkblots. The offenders included 84 males and 37 females ages 12 to 15; among them were 48 Native Americans. In 1992 after a mean elapsed time of 9.9 years, all 121 subjects were followed up and classified as either guilty (n=61) or not guilty (n=60) of a serious offense as an adult. Stepwise discriminant function analysis was used to find the best subset of variables with which to distinguish between the adults with a serious criminal record and those without. In order of importance, the four significant predictors selected from among 20 candidate variables were the WISC-R comprehension subtest, gender, North American Native status, and DQ+ from the Rorschach. A correct classification rate of 77.8 percent (as opposed to a base rate of 50.5 percent) was achieved. 2 tables, 3 notes, and 36 references