This collection of readings is intended for those concerned with directed social change--researchers, social planners, administrators, and social scientists. The papers address such issues as the nature of the evaluation task, the role of evaluation research in programs of directed change, the organizational context in which evaluation research is conducted, and the appropriate methodology. Specific case studies are discussed and an integrated view of the entire field is presented by including a review of writings about evaluative research, not limited to selections in the book, in an introductory chapter. (MS)