The richness of Hilary Putnam's philosophical oeuvre consists not only in the broad spectrum of problems addressed but also in the transformation and restructuring his positions have undergone over the years. The essays collected in this volume are sensitive to both these dimensions. They discuss Putnam's major philosophical contributions to the theory of meaning, the philosophy of mind, the philosophy of science and mathematics, and moral theory. But, in addition, tracing threads of change and continuity, they analyze the dynamics underlying the unfolding of Putnam's thought. The volume also constitutes a critical introduction to a number of central issues in contemporary philosophy, including quantum logic, realism, functionalism, the 'mind as computer' metaphor, and the fact/value dichotomy.