This groundbreaking study maps out and analyzes the development of a global intergovernmental (IGO) institutional architecture in the post World War II era.

• Systematically traces similarities and differences between the institutional architecture of the Cold War and post-Cold War eras
• Examines the range of reasons why states join IGOs, identifies patterns of participation within these organizations, and examines the effects of membership on states
• Considers the impact of the EU on other regional organizations and developments outside Europe
• Provides a strong contribution to the study of international organization and IGO development combining both quantitative and qualitative methodologies