This collection of essays presents cutting-edge research on a classic philosophical problem --- the link between reasoning and practice. The essays, by such well-known thinkers as Davidson, Scheffler, Sunstein, Dworkin, and Stroud, cover a range of issues raised by the move from thought to action. The book represents an inquiry into the very nature of reason, reasoning and reasons, rationale, rationalization, and rationality. These essays also connect philosophical thought with concrete issues in social life and political practice, thus, it will be of interest not only to philosophers, but also to political theorists, legal scholars, and any researcher interested in the practical applications of reason.