Abstract
This paper examines the relation of individual perceptual, conscious, and self-regulatory processes to the generation of requisite complexity in formal and informal leaders. Requisite complexity is a complex adaptive systems concept that pertains to the ability of a system to adjust to the requirements of a changing environment by achieving equivalent levels of complexity. We maintain that requisite complexity has both static and dynamic aspects that involve four domains (general, social, self, and affective complexity), with each being more or less important for leaders depending upon the task requirements they face. Dynamic complexity draws on these static components and also creates new aspects of complexity through the interaction of mental processes. The implications of these issues for understanding leader adaptation and development are also discussed.