This study was to compare the Wechsler Adult Intelligence Scale (WAIS) and the General Aptitude Test Battery (GATB) and to examine the results of these tests in terms of usefulness to the vocational counselor. The population selected had a sixth grade modal reading level and a modal age between 22 and 29, and achieved the fifth grade level in arithmetic. It was 9/10th Negro and 6/7ths female. More than half the subjects failed to make more than two patterns, two or less patterns being the criteria of five experienced counselors for determining the usefulness of the GATB results. The range of scores on the WAIS demonstrated the enormous variance of abilities of the clients tested. On the other hand, because over half of the subjects failed to meet the criteria the GATB was found to lack variability. The primary weakness of the WAIS was that the subtests were not factored for vocational and occupational areas. In this respect, the GATB would be useful if the scores were more readily available. The shortcomings of the GATB seem to outweigh its usefulness for evaluation of a population such as the one used in this study. (Author/NL)