The purpose of this study was to investigate the amount and patterns of interrelatedness of the Wechsler Intelligence Scale for Children (WISC) and the 1968 revised edition of the Illinois Test of Psycholinguistic Abilities (ITPA). The study attempted to analyze from both the practical and statistical levels relationships between the two instruments. Further clarification was sought as to the: (1) dimensions measured by the ITPA, (2) concurrent validity of the ITPA, and (3) necessity of administering both instruments in their entirity in psychological evaluations.