Originally published in 1989, this title showcased new developments, providing a systematic and in-depth overview of some of the basic issues in the field of group psychology. Subject areas range from basic group processes to complex interactive phenomena. There are international contributions, with chapters covering the latest developments in the field at the time. The volume provided students and professionals with a comprehensive, coherent, and interrelated picture of the broad scope of group influence processes. The volume was motivated by the belief that group psychology is a central and important activity for social psychology.