The Kaufman Brief Intelligence Test (K-BIT) was used as a screening instrument to predict Wechsler Intelligence Scale for Children-Third Edition (WISC-III) scores of 94 students referred for psychoeducational evaluations. Although the correlation coefficient between the K-BIT IQ Composite and the WISC-III Full Scale IQ was 0.771 for the entire sample, the correlation coefficients and effectiveness of the K-BIT as a screening instrument were found to differ depending on the population. For a potentially learning disabled sample, the K-BIT Composite IQ correlated with the WISC-III Full Scale IQ at 0.51. For a potentially intellectually gifted sample, the K-BIT correlated with the WISC-III at 0.34. The mean K-BIT Composite IQ for the entire referred population was found to be 6.926 points less than the average WISC-III IQ. These findings do not support the use of K-BIT as a screening instrument when the WISC-III is used as the criterion measure of intellectual ability. (Contains six tables.) (Author/SLD)