In July 2001 the Macquarie Centre for Cognitive Science sponsored an interdisciplinary workshop on evolutionary psychology in conjunction with the Philosophy Program at the Australian National University. An outstanding cast of theorists and researchers from a diversity of psychological, philosophical, anthropological and biological backgrounds participated in the conference, and this volume contains some of the most intriguing and important papers to emerge from it. Covering a range of topics, from the evolution of language, theory of mind, and the mentality of apes, through to psychological disorders, human mating strategies and relationship processes, this volume makes a timely and significant contribution to what is fast becoming one of the most prominent and fruitful approaches to understanding the nature and psychology of the human mind.