This text reflects the breadth and diversity of contemporary public international law, offering original contributions from key authorities actively involved in the current practice and teaching of international law. Coverage closely follows the scope of current courses, opening with a series of short introductory contributions from those in such varied institutions as; the International Civil Service, the International Court, a law firm and the Bar. These personal reflections offer a cross-section of stimulating perspectives upon the role of international law in various spheres of legal and public life and introduce elements of international law that are addressed in later chapters. Parts I-VI consider the key building blocks of the law, addressing elements of history, theories and sources of international law, organizational bodies and place the notions of sovereignty, responsibility and obligations within an international context. The final part provides a series of overviews of contemporary issues and areas of interest such as international environmental law, international criminal law and the international protection of human rights.