Part 1: Articles. Necessity Across International Law.- Necessity across international law - an introduction.- Necessity and the use of force: a special regime.- Necessity in the law of armed conflict and in international criminal law.- State responsibility, necessity and human rights.- A necessity paradigm of necessity in international economic law.- Necessity in investment arbitration.- Necessity in international environmental law.- The notion of necessity in the law of the European Union.- Part 2: Documentation.- Classification Scheme.- Netherlands state practice for the parliamentary year 2008-2009.- Treaties and other international agreements to which the Kingdom of the Netherlands is a party Conclusions and Developments 2009.- Netherlands municipal legislation involving questions of public international law, 2009.- Netherlands judicial decisions involving questions of public international law, 2008-2009.