The nature of time has haunted humanity through the ages. Some conception of time has always entered into our ideas about mortality and immortality, and permanence and change, so that concepts of time are of fundamental importance in the study of religion, philosophy, literature, history, and mythology. How humanity experiences time physiologically, psychologically, and socially enters into the research of the behavioral sciences, and time as a factor of structure and change is an essential consideration of the biological and physical sciences. This volume presents selected essays from the 13th triennial conference of the International Society for the Study of Time: Time: Limits and Constraints." The essays are grouped around subthemes relating to this theme: Theory and Empirie, The Limits of Duration, Creative Constraints, and Final Questions. The ISST has as its goal the interdisciplinary and comparative study of time.