Standardization data for the Children's Category Test (CCT) and California Verbal Learning Test–Children's Version (CVLT–C) were used to evaluate covariances and statistically significant discrepancies between the T scores of those instruments, as well as the base rate of specific discrepancies. The results indicate that the CCT and CVLT–C share only a limited amount of common variance and that statistically significant discrepancies between the respective T scores are actually quite common. It is suggested that evaluation of the potential clinical significance of a discrepancy between the obtained results of these two instruments in individual cases should include consideration of the presented base rates. (JINS, 1998, 4, 242–246.)