In this work aggression and conflict in man and other primates are interpreted in the light of evolutionary biology and game theory models. Unitl now interdisciplinary collaboration between the humanities and the natural sciences has been rare and hampered by different methodologies and terminology. Nevertheless, such cooperation is essential for elucidating the causes and consequences of aggression in humans and in explaining what shape aggression takes in particular situations. The aim of this volume is to present empirical and theoretical studies from biologists and social scientists to create an interdisciplinary framework for understanding aggression.