The standardization sample of the Saudi Wechsler Intelligence Scale for Children--Revised (WISC--R) furnished the Ss: 1,100 girls and boys divided into 6 age groups (aged 6, 7-8, 9-10, 11-12, 13-14, and 15-16 yrs), with equal gender numbers in each group. Principal-factor analysis of the correlation matrix with R-sup-2 as the initial communality estimate was performed, with a varimax rotation for males and females separately in each age group. The coefficient of congruence and the Pearson correlation of factor loading scores examined factor similarity for males and females across age groups. L. S. Feldt's (1969) index (W) compared reliability coefficients of males and females on the subtests. Results suggest that the Saudi WISC--R holds against factorial dissimilarity across sex and age. Accuracy of measurement was about the same for females and males.