Factor analyses of the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) was conducted. The random sample included 100 boys and 100 girls beginning at age four with increments of 6 months up to age 6 1/2. The intercorrelation matrix of the 11 WPPSI subtests at each of the age levels was factor analyzed, and the percent of common, specific, and error variance was calculated for each subtest. The two-factor solution, closely approximating Wechsler's a priori grouping into Verbal and Performance scales, was retained at each age level as the most psychologically and psychometrically sound solution to describe the 11 WPPSI subtests. Calculation of the coefficients of congruence confirmed the stability of the factor structure across all age levels. With the exception of subtests Information and Comprehension, there appears to be adequate test specificity to allow for individual interpretation in the determination of a child's cognitive strengths and weaknesses prior to developing and implementing an individual educational program. (RL)