""Counterfactual Thought Experiments in World Politics" is an important book for all social scientists, not only those who study international relations. The introductory paper, outlining different ways of using counterfactual arguments, is likely to become a standard reading in courses on methodology and research design. Many of the other chapters are outstanding; some are brilliant. When I next teach my graduate seminar on research design, this book will be on the required reading list."--Robert Keohane, Duke University
