Social identity research is very much on the ascendancy, particularly in the field of organizational psychology. Reflecting this fact, this volume contains chapters from researchers at the cutting edge of these developments and presents findings from a range of key international research programmes. Its 17 chapters are organized into 6 sections dealing in turn with the nature of identity, motivation and performance, communication and decision-making, leadership and authority, change and change management, and perceiving and responding to inequity. In the process the chapters address a broad range of topical issues including diversity, discrimination, goal-setting, groupthink, mergers, negotiation, and culture. Moreover, while presenting a compelling framework for theoretical advance in each of these areas, the chapters also discuss wide-ranging issues of practical intervention and application. The result is a text that will be essential reading for students and researchers in social and organizational psychology, as well as many others who are interested in social identity and group behaviour at work.