This study has 13 chapters. The first chapter introduces the study, with a background of reference to data from previous research on school desegregation studies. Chapter 2 discusses the events leading up to and ensuing from the desegregation decision of the Riverside California School District Board of Education. Chapter 3 gives an overall picture of the study's research design and its limitations. Chapter 4 is on short and long term achievement effects, and Chapter 5 on IQ and its relation to achievement. The effects of desegregation on attitudes and values and the way in which these personality predispositions might possibly mediate achievement are then examined in three interrelated chapters. Chapter 9 examines linguistic changes and also reports an attempt to develop and use a measure of speech anxiety. The effects of the social and cultural context on the course of desegregation are reported in the three succeeding chapters, one focusing on the influence of teacher attitudes, the second concerned with the social structure of the classroom, and the third looking at factors in the parents' background. The final chapter summarizes the study within the context of a broad societal perspective. In this report of the data, the general focus is an attempt to examine initial ethnic differences on the particular variables in question, the effect of desegregation on these variables, and in turn, their influence on achievement. (Author/JM)