First published in 1987. Routledge is an imprint of Taylor & Francis, an informa company.

This book, first published in 2001, features integrative theoretical and empirical work from social psychology, sociology, and psychology.

The importance of justice cannot be overstated. As one author has put it, "A better understanding of how justice concerns develop and function in people's lives should enable us to plan more effectively for institutional and other social change to deal with the problems that confront humankind" (S. C. Lerner, 1981, p. 466). The volume in which that statement appeared-an earlier one in this same series-was devoted to exploring the impact that dwindling resources and an increasing rate of change have had upon people's concern for justice. In contrast, the present volume places greater emphasis on the word under standing, as it was used in the context of the preceding quotation, than upon effective planning, social change, and ways of dealing with human problems. Nothing in that statement of purpose is meant to belittle the urgency of translat ing understanding into action, because the social significance of justice concerns is a major factor that has prompted the authors of the chapters in this book to do research in the area. Rather, this volume receives its emphasis from Kurt Lewin's famous dictum there is nothing so practical as a good theory. The need for good theory is ongoing, and these pages are dedicated to a search for new pathways toward better theory.

In the fall of 1983, we began to organize a symposium entitled "General Social Psychological Theories of Group Behavior." Our goal was to encourage the extension and application of basic current social psychology to group behavior. The symposium was presented in the spring of 1984 at the Eastern Psychological Association convention in Baltimore and the interest that it generated led to discussions with colleagues and friends about similar efforts by social psychologists, eventually resulting in the present book. Some clarification about the contents is in order. First, the theories presented here are clearly social psychological in scope and level of analysis, as discussed in the Introduction (Chapter 1). However, we are not trying to encompass sociological, anthropological, political, or historical theoretical approaches to group behavior. Second, while the theories comprise a wide-ranging and representative, if not quite exhaustive, selection of social psychological theories of group behavior, there are some interesting and general perspectives that are not represented. For example, one perspective that is conspicuous by its absence is some variant of learning theory. Aside from the rare, notable exception (e.g., Buss, 1979), little work currently is being done on group behavior from a learning theoretic perspective. Our inclusion or exclusion of a theory reflects our judgment regarding its currency and accessibility to social psychological researchers.

First published in 1986. This volume presents papers from the fourth Ontario Symposium on Personality and Social Psychology, held at the University o f Western Ontario, October 15- 16, 1983. The contributors are active researchers in the areas of relative deprivation and social com parison, whose chapters document the continuing vitality of these topics. One of the purposes of this volume is to provide an accurate picture of our current knowledge about relative deprivation and social comparison processes.

Comparison of objects, events, and situations is integral to judgment; comparisons of the self with other people comprise one of the building blocks of human conduct and experience. After four decades of research, the topic of social comparison is more popular than ever. In this timely handbook a distinguished roster of researchers and theoreticians describe where the field has been since its development in the early 1950s and where it is likely to go next.