This study, the fourth in a series conducted at the Navy's Basic Electricity and Electronics School for a computer managed instruction project, reports the relationships among selected measurements of student cognitive styles, abilities, and aptitudes. Measures of these characteristics for a sample of 166 graduates of BE/E were analyzed to determine the nature and magnitude of their relationships. Canonical analyses established that measures of cognitive styles were significantly related to measures of aptitudes and abilities, but their common variance was not large enough to be of practical value. Measures of aptitudes were significantly related to measures of abilities and the two sets to have a considerable amount of shared variance. When the various measures were factor analyzed, three significant factors--technical aptitude, verbal ability, and problem solving mode--accounted for much of the variability among the measures of cognitive characteristics. Thus it was concluded that cognitive styles are relatively independent of abilities and aptitudes and should be considered in selection of BE/E students, in predicting their performance, likelihood of attrition, and adapting alternative teaching treatments to student attributes. (Author/RAA)