This chapter outlines the measurement and interpretation of cognitive style using the conceptual structure of Educational Cognitive Style and the Educational Sciences developed by Dr. Joseph Hill and others. The measurement and interpretation of 36 aspects of cognitive style are discussed, as well as the use of cognitive style mapping (the graphic interpretation of cognitive style inventory responses) in describing the instructional environment of different types of instructional approaches. The use of cognitive mapping in matching the students' and instructor's cognitive styles to that of the instructional method is also described. A model developed under the auspices of the National Special Media Institutes (NSMI) is also discussed, with emphasis on its use for individualizing and personalizing instruction using cognitive style as the center of the organization. The text is supplemented with 3 figures, and a 13-item bibliography is provided. (Author/EW)