Clear and compellingly written, this comprehensively revised second edition introduces readers to the major developments in the field of group processes. All chapters have been thoroughly updated, and several new sections have been added. There are considerably extended treatments of such key topics as group cohesion, social comparison, leadership, social facilitation, group performance, sociocognitive aspects of intergroup relations, and social identity processes. The new material is woven seamlessly into the existing structure of the book, integrating the latest theory and research with classic contributions from the past. Many illustrations from contemporary life support the text throughout.