Part I. Theoretical and Practical Perspectives on the Responsibility to Protect: 1. The coining and evolution of responsibility to protect: the protection responsibilities of the state Diana Amnéus; 2. Non-state actors Raphaël van Steenberghe; 3. Peacekeeping operations Susan C. Breau; Part II. The United Nations System: 4. The Security Council Terry D. Gill; 5. The General Assembly Cedric Ryngaert and Hanne Cuyckens; 6. The Secretary-General Nicholas Turner; 7. The UN Human Rights Council Lyal S. Sunga; 8. The International Law Commission Arnold Pronto; Part III. Regional and Security Organisations: 9. The European Union Daniel Fiott and Marie Vincent; 10. The African Union Solomon A. Dersso; 11. The Association of Southeast Asian Nations Noel M. Morada; 12. The Organisation of American States Paulo de Tarso Lugon Arantes; 13. The Arab League Mahasen Aljaghoub, Ibrahim M. Aljazy and Maysa S. Bydoon; 14. The Organisation for Security and Cooperation in Europe Dennis J. D. Sandole; 15. The North Atlantic Treaty Organisation Jody M. Prescott; Part IV. International Courts and Tribunals: 16. The International Court of Justice Gentian Zyberi; 17. The United Nations Criminal Tribunals for Yugoslavia and for Rwanda Niki Frencken and Göran Sluiter; 18. The International Criminal Court Michael Contarino and Melinda Negron-Gonzales; Part V. Regional Human Rights Protection Mechanisms: 19. The European System of Human Rights Rhona Smith and Conall Mallory; 20. The Inter-American System of Human Rights O. Hilaire Sobers; 21. The African System of Human Rights Frans Viljoen; Part VI. Concluding Remarks: 22. Sharing the responsibility to protect: getting from promise to practice Gentian Zyberi.