Includes many original contributions by an assembly of distinguished social scientists. They set forth the main features of a changing American society: how its organization for accomplishing major social change has evolved, and how its benefits and deficits are distributed among the various parts of the population. Theoretical developments in the social sciences and the vast impact of current events have contributed to a resurgence of interest in social change; in its causes, measurement, and possible prediction. These essays analyze what we know, and examine what we need to know in the study, prediction, and possible control of social change.