• Two new chapters—on immunity and international humanitarian law • Expanded chapters on the law of treaties and international economic law • Complete reworking of the chapter on collective security law • Discussion of the responsibility of international organizations • Inclusion of the post-Kyoto regulation in the international environmental law chapter • Analysis of the procedural concerns raised by the first case to be decided by the ICC, Thomas Lubanga, and an assessment of its impact on the development of war crimes elements: actus reus and mens rea