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Although the Type A behavior pattern is firmly established as a risk factor for coronary heart disease, it is not well understood from a psychological perspective. The present article (a) summarizes the behavior that empirical data indicate characterizes persons who score high and low on measures of Type A,(b) evaluates existing efforts to specify psychological dimensions underlying Type A in light of these verified behavioral characteristics, and (c) discusses some potential difficulties inherent in doing Type A research. Gaps in knowledge are made apparent, thereby suggesting some directions for future psychological research.(5 p ref)(PsycINFO Database Record (c) 2016 APA, all rights reserved)