1. Introduction -- 2. Actors' Interests, Policy Preferences, and the Demand for International Cooperation -- 3. A Model of the Two-Level Game / Helen V. Milner and B. Peter Rosendorff -- 4. Political Institutions and International Cooperation -- 5. The Bretton Woods Monetary Agreement and the International Trade Organization, 1943-1950 -- 6. The Anglo-American Oil Agreement and the International Civil Aviation Agreement, 1943-1947 -- 7. The European Coal and Steel Community and the European Defense Community, 1950-1954 -- 8. The North American Free Trade Agreement and the Maastricht Treaty on European Monetary Union, 1989-1993 -- 9. Conclusions -- Appendix / Helen V. Milner and B. Peter Rosendorff.