Abstract: This book holds as its central premise the notion that effective and meaningful evaluation is achieved through utilization of social science research methodologies but conducted in an action context. The book is designed to function as a basic text in evaluation of social programs for both undergraduate or graduate students. Topical areas dealt with in a chapter by chapter approach include purposes of evaluation, formulating the question and measuring the answer, design of the evaluation, the turbulent setting of the action program, and utilization of evaluation results.