The 4th European Society of International Law (ESIL) biennial conference was held in Cambridge, UK, on 2-4 Sept. 2010. The theme of the conference was "International Law 1989-2010: A Performance Appraisal". Hosted by the Lauterpacht Centre for International Law, the Conference was an outstanding success, with over 350 participants gathering to appraise the performance and direction of international law and international institutions from the end of the cold war to 2010 and beyond. This is a recording of the closing plenary session, and features: Professor James Crawford, Dr Anne Lagerwall, Dr Amanda Perreau-Saussine, Dr Thomas Skouteris, Dr Guglielmo Verdirame, Dr Jochen von Bernstorff, and Professor Andrew Hurrell.