The chapters in this volume have been written by authors whose research work emphasizes the aggression-eliciting characteristics of people and other animals, the traits that make them targets of aggressive behavior. The clear focus of the book is on aggression by humans, although some of the authors may refer to data from other species. Chapters include aggression and violence towards other species, sexual minorities, psychiatric workers, school children, athletes, women, and drivers on highways. There are additional targets of aggressive behavior which have not been included because they are not emphasised in the research literature of psychology. Since the major concern of psychological science is with the behavior of individuals rather than groups, topics such as racial violence, warfare, and political violence have been specifically excluded.