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Factorial similarity across sex and age for the Saudi version of the Wechsler Intelligence Scale for Children-Revised (WISC-r-R) was investigated. Separate factors for males and females across age groups were arrived at through the use of principal-factor analysis on the normative sample’s data. Similarities of factor structure for males and females across age groups were assessed via the use of congruence and correlation coefficients. Furthermore, Feldt’s test (W) was used to assess constancy of errors due to domain sampling. The results indicated similarity of factors for males and females across age groups. Accuracy of measurement was about the same for males and females. Implication of the results for test validity is discussed.