Reported is a study, using five instruments of varying objectivity, designed to measure the degree of quantitative analytic (QA) and non-quantitative analytic (NQA) nature in students. One hundred forty ninth-grade students in a semi-rural high school were administered these instruments by the researcher, and correlations were computed between each instrument, IQ and school grades. A factor analysis of the correlations identified two general factors measured by the instruments. One related closely to the instruments, Interview, Card Sort and Picture Viewing. The other related to the whole-class situation, generally teacher-related and test-oriented instruments, the Test, Teacher Evaluation and grades. Correlations between instruments within the two factor groups were significant at the 0.01 level. Reliability coefficients of 0.73 and 0.67 were calculated from the Card Sort and Test instruments respectively; none could be calculated for the remaining instruments. Face validity was established by judging panel, based on adherence to the defined cognitive styles. Normal distributions of scores were observed for all instruments, allowing combination of scores to yield a combined battery score useful in making a final classification of individuals. (Author/EB)