This landmark work offers a tour of the latest developments in Social Identity Theory from the leading scholars in the field. First proposed by Tajfel and Turner in 1979, Social Identity Theory has proved enormously influential in stimulating new theory and research, and in its application to social problems. The field is developing apace and important new lines of work have opened up in the past few years. The three sections of the book cover: theoretical contributions to the field; recent empirical assessments of key elements of the theory; and applications of Social Identity Theory to bring about changes in problematic intergroup relationships.