Introduction: the modes of global governance Michael Barnett, Jon Pevehouse and Kal Raustiala; 1. Governance shifts in security: military and security services and small arms compared Deborah Avant; 2. The Bretton woods moment: hierarchies, networks, and markets in the long twentieth century Miles Kahler; 3. Climate change governance: past, present and (hopefully) future Jessica Green; 4. A shadow of its former self: hierarchy and global trade Susanne Mueller and Jon Pevehouse; 5. The humanitarian club: hierarchy, networks, and exclusion Michael Barnett; 6. The supply of informal international governance: hierarchy plus networks in global governance Michael Manulak and Duncan Snidal; 7. Global governance, expert networks, and 'Fragile States' Leonard Seabrooke and Ole Jacob Sending; 8. Global health: a centralized network in search of hierarchy Surie Moon; 9. The governance of International Humanitarian Law: a century-old hybrid model Anne Quintin and Vincent Bernard; 10. Clean energy and the hybridization of global governance Lilliana Andonova; 11. Legitimacy and modes of global governance Jonas Tallberg; Conclusion: global governance and institutional diversity Orfeo Fioretos.