This book delineates a pluralist and dynamic model of practical action which thoughtfully takes into account the reflexive conception of agency that is, by and large, prevailing in current social sciences research. Such a model will challenge the one the cognitive sciences have rather successfully imposed on our understanding of the relationship between knowledge and action. To make this model available, the book compares Wittgenstein's theses on knowing, the pragmatist outlook on inquiry and the analysis of action in common offered by interactionist sociology. It thus shows how an integrated theory of practical action would warrant a radically contextual conception of human individual and collective behaviour.

Until the mid-1980s, AI researchers assumed that an intelligent system doing high-level reasoning was necessary for the coupling of perception and action. In this traditional model, cognition mediates between perception and plans of action. Realizing that this core AI, as it was known, was illusory, Rodney A. Brooks turned the field of AI on its head by introducing the behavior-based approach to robotics. The cornerstone of behavior-based robotics is the realization that the coupling of perception and action gives rise to all the power of intelligence and that cognition is only in the eye of an observer. Behavior-based robotics has been the basis of successful applications in entertainment, service industries, agriculture, mining, and the home. It has given rise to both autonomous mobile robots and more recent humanoid robots such as Brooks' Cog.

This book represents Brooks' initial formulation of and contributions to the development of the behavior-based approach to robotics. It presents all of the key philosophical and technical ideas that put this "bottom-up" approach at the forefront of current research in not only AI but all of cognitive science.