Cognitive style is a continuing area of interest in MIS research. The work is often criticized for its fragmentation and lack of validity. This paper proposes the uses of a single instrument, the Myers- Briggs Type Indicator (MBTI). It reviews the overall issue of validity and identifies the four steps cognitive style research must accornplish to achieve coherence. It assesses existing research related to those steps, focusing on findings from studies that use the MBTI. ;t presents data on cognitive style differences among occupational specialties.