Designed to investigate the performance of American Indian youth on the "Wechsler Intelligence Scale for Children" (WISC) compared to the "Chicago Non-Verbal" (CNV) for the purpose of establishing validity and reliability of the measurement and appraisal tools, this study analyzed test data from 71 Indian youth (aged 11 to 15) attending the Riverside Summer Institute, Anadarko, Oklahoma, in 1970. It was concluded that differences do exist among Indian youth on the 2 tests. WISC scores showed lower scale scores than the CNV except in performance. Males had a higher performance correlation on the WISC subtests than females. The performance scale of the WISC was higher for boys and girls than the CNV. The performance scale for males was 103.413 on the WISC and 95.289 on the CNV. Results indicated that the WISC is a better indicator of performance for Indian males than the CNV; however, cultural factors and tribal differences were considered as limitations. Included in addition to a description of the study and findings are a literature review; a 9-item bibliography; and tables showing mean, standard deviation, and standard error of test scores. (MJB)