The concurrent validity of the Wechsler Preschool and Primary Scale of Intelligence—Revised (WPPSI—R) and the McCarthy Scales of Children's Abilities was assessed with 32 preschool and kindergarten children. The correlations of .70, .73, and .81 between the McCarthy General Cognitive Index and WPPSI—R IQs on the Verbal, Performance, and Full Scales were significantly different from zero. There were no differences among the three WPPSI—R means and the McCarthy General Cognitive Index mean for the total group, or for gender means.
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