Social identity and social categorization theories have offered some of the most exciting developments in social psychology - informing work on everything from intergroup relations to personal identity. This comprehensive and wide-ranging book surveys the latest empirical and theoretical findings, alongside original contributions, to provide an invaluable overview of this important field.Bringing together an international cast of contributors, Social Identity explores a broad range of psychosocial phenomena including intergroup discrimination, influence, group polarization, collective behaviour, impact of minorities, prejudice, stereotypes and leadership. This book maps some of the key debates in contemporary social psychology. It will be essential reading for academics and students in psychology and related fields.