Psychology, focusing on processes that occur inside the individual and Sociology, focusing on social collectives and social institutions, come together in Social Psychology to explore the interface between the two fields. The core concerns of social psychology include the impact of one individual on another; the impact of a group on its individual members; the impact of individuals on the groups in which they participate; the impact of one group on another. This book is a successor to Social Psychology: Social Perspectives and Sociological Perspectives in Social Psychology. The current text expands on previous handbooks in social psychology by including recent developments in theory and research and comprehensive coverage of significant theoretical perspectives.