This book provides researchers, evaluators, and graduate students with a user-friendly presentation of Donald T. Campbell's essential work (including his thoughts on some of his classic works) in social experimentation. The book includes Campbell's exploration of the experimenting society and how experimentation can be used to improve society; the compatibility of quantitative and qualitative methods for validity seeking; threats to the validity of social experiments and how they can be controlled; the degree to which the social sciences can achieve scientific status; and the degree to which the operations, products, and consequences of science have a social impact. By including introductions for each part and detailed overviews to each article, Social Experimentatio n provides social scientists with useful insights into Campbell's papers in a format accessible to advanced undergraduate and graduate students.