"The book sets out to examine the many roles that counterfactuals and counterfactual reasoning play in the study of world politics. It has many merits. The quality of the papers is high. It is well edited by Philip E. Tetlock and Aaron Belkin. It succeeds very well in building on earlier discussions of counterfactuals in social science, from Weber to Elster, and linking them with a wide range of concrete problems and issues in international relations."--Andrew Hurrell, The Times Literary Supplement