The purpose of this study was to investigate the construct validity of the Occupational Aptitude Survey and Interest Schedule (OA-SIS) by comparing interest and aptitude scores of a sample of 126 community college students majoring in different academic areas. Planned orthogonal comparisons revealed that science majors scored highest on the Scientific interest scale, mechanical majors scored highest on the Mechanical interest scale, business majors scored highest on the Business Detail interest scale, and humanitarian majors scored highest on the Humanitarian interest scale. These results replicate and extend the findings of Parker and Green (1987).
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