The purpose of the study was to develop a revision of the logical reasoning section of the California Test of Mental Maturity which increases its discriminative ability while maintaining an acceptable measure of reliability. Subjects were 102 students of general psychology classes at North Texas State University. All were administered the Logical Reasoning section of the California Test of Mental Maturity in its original form and an experimental revision of it (LRTR). The Wesman Personnel Classification Test was administered at the same time to demonstrate the tests' construct validity. Pearson product-moment correlations, item and homogeneity analyses were run. Results indicated that the revised test correlated significantly with the original test and the WPCT. Internal validity of the revised test was satisfactory, showing an improvement over the original test in terms of clarity, reliability and homogeneity.