Written by a distinguished psychologist, this book is an integrated treatment of the mathematical theory of human response times. Professor Luce provides a comprehensive, well-balanced, and clear review of the experimental data and puts forth the relevance of the hazard function, a novel and important approach he and his colleagues have developed. Since measurements of response times are widely used by experimental psychologists as one approach to distinguishing among theories of intellectual functioning, the conceptual arguments Professor Luce brings to bear on mathematical models of response time are of great relevance to mathematical and experimental psychologists.