The law of international responsibility plays a fundamental role in the modern system of international law, surpassed by none and paralleled only by the law of treaties. The volume seeks to cover the entirety of the field of international responsibility, with a particular focus on the work of the International Law Commission. It provides detailed discussion and analysis of the historically predominant topics of State responsibility, on which the ILC completed its work in 2001, and the specific sub-topic of diplomatic protection, work on which was completed by the ILC in 2006. However, it also covers both the topic of responsibility of international organizations, on which the ILC's work is ongoing (a set of draft Articles having been adopted on first reading in 2009), and that of liability for harmful activities not prohibited under international law on which the ILC adopted drafts in 2001 and 2006. The volume comprises contributions on specific issues in the international law of responsibility, authored by an international team of specialists in the field, which provides a comprehensive commentary of all aspects of the topic. The chapters are detailed in their coverage, discussing both international jurisprudence and doctrinal controversies, as well as providing a critical assessment of the relevant work of the ILC. In addition to providing detailed consideration of the general secondary rules of international responsibility, coverage is also included of certain specific systems of responsibility and their relationship with the general rules under a number of specialised regimes, in particular under certain human rights treaties, the WTO, and investment protection treaties.