The effects of alterations in test procedure upon the original and repeated test performance of normal adolescents are determined for two subtests--Block Design (BD) and Picture Arrangement (PA)--appearing in the Wechsler Intelligence Scale for Children and Wechsler Bellevue Intelligence Scale Form 1. Two experiments were conducted, one with 170 eighth and ninth grade students and the other with 146 seventh and eighth grade students. The first experiment used only the BD subtest, while the second used both the BD and PA subtests. In both experiments an alternative form of the subtest was administered immediately after the first, with help given on the first administration only. The results included: (1) Administering help and giving cues did not affect test performance of the first experiment, but did affect that of the second, (2) different examiners do not obtain significantly different test scores, (3) there is little difference between sexes in the test scores, (4) grades are poor predictors of the BD and PA subtests, and (5) SCAT scales are highly correlated with grades. (HW)