"Evolutionary arguments are increasingly used as explanations in a wide range of human sciences - psychology, economics, anthropology - as well as in biology itself. However, these arguments are frequently employed on the basis of a secondhand understanding of the principles by which they are derived. This is the first book to provide a thorough but accessible grounding in the methods underlying the major topics in the evolution of social behavior. It should become required study for graduate students in evolution and human behavior." - Daniel Nettle, Newcastle University"