Increasing interest over recent years in the study of the influences of environment and genetic factors on behavioural disorder has come from a wide range of disciplines. These studies have subsequently been focused through the foundation of the Society for the Study of Behavioural Phenotypes, which forms the basis for assimilating new information and coordinating future research in this field. This volume from founder members of the society presents a distillation of thinking and reviews appropriate measurement schedules. Including research findings, explanation of concepts, genetic scientific techniques and methodological issues, this work will be welcomed by those with an interest in behavioural disorder at every level.