This study presents both classic and contemporary readings about the organisations that are critically important in mediating global politics. Highlighting the major changes and challenges in the international system since the end of the Cold War, the book considers a diverse range of international organisations, including institutions that influence the global political economy, for example, the World Bank and the European Union. It also gives detailed coverage of contemporary pollicy areas, such as peacekeeping, trade and social and humanitarian issues. The essays have been selected for their accessibility and their ability to emphasise the major themes, theories and approaches involved in the study of international organizations. The book features a general introduction by the editor, part-introductions that provide background to the readings, and an appendix containing the Covenant of the League of Nations and the Charter of the United Nations.