This book is about the genetics and behaviour of individuals within colonies of social insects - bees, wasps, ants, and termites. Colonial living is characterized by division of labour and finely coordinated organization, by reproductive function being limited to certain individuals, bycooperative brood care, and by the presence of non-reproductive workers. Within a colony, however, may events are the result of conflicts between individuals seeking to maximize their own interests. Crozier and Pamilo's contribution is to analyse the genetic bases of the patterns of reproductionand resource allocation found in social insect colonies. This is done more comprehensively and with greater depth and insight than in any previous study, and is a significant step forward in the fields of population genetics and social evolution.