Introduction: Effectiveness of Multilateralism in the Field of Collective Security, Joachim Krause and Natalino Ronzitti Part I: Theoretical Approaches to and Historical Developments of Global Governance in the Field of Collective Security 1. Global Governance in the Field of Collective Security – How to Make Multilateralism more Effective, Joachim Krause 2. Effectiveness and Ineffectiveness of the UN Security Council in the Last 20 Years: a European Perspective, David Hannay 3. Effectiveness and Ineffectiveness of the UN Security Council in the Last 20 Years: a US Perspective, John van Oudenaren Part II: The UN Security Council 4. The reform of the UN Security Council, Natalino Ronzitti 5. The EU’s Contribution to the Effectiveness of the UN Security Council between Presence and Impact, Nicoletta Pirozzi Part III: UN Peacekeeping 6. UN Peacekeeping Missions during the Past Two Decades – How Effective Have They Been?, Denis Tull 7. Options for Improving EU-UN Cooperation in the Field Of Peacekeeping, Alexandra Novosseloff Part IV: International Peacebuilding and State-building 8. International Peacebuilding and State-building Efforts: How Effective Have They Been?, Keith Crane 9. Building Peace in Post-Conflict Environments: Why and How the UN and the EU Interact, Thierry Tardy 10. Constructing a Framework of Effective Multilateralism: Conclusions for the Field of Collective Security, Inna Melnykovska and Nicoletta Pirozzi Appendices Appendix 1. The UN Security Council Reform Process: Recent Developments, Elisabetta Martini Appendix 2. Joint Declaration on UN-EU Cooperation in Crisis Management Appendix 3. Joint Statement on UN-EU Cooperation in Crisis Management Appendix 4. Major Stages of the Institutionalization of the UN-EU Cooperation Appendix 5. Contributions of European States to UN Peacekeeping Operations Appendix 6. EU Autonomous Operation in Support of a UN Peace Operations Appendix 7. Operations Involving UN-EU Cooperation since 2003