The book addresses the impact of the first judgment of the 'World Court' on the development of international law and its continuing relevance. The contributions to this book discuss the legal issues decided by the PCIJ in the Wimbledon case. In the Wimbledon judgment, the Court referred to the problems that are still important both for procedural and substantive international law, and which attract the attention of states, courts and the academia today. These include: state sovereignty, sources of international law, interpretation of legal rights and obligations following from treaties and custom, ‘objective regimes’, ‘self-contained regimes’, neutrality in armed conflicts, the status of international waterways, as well as the issues of jurisdiction such as third-party participation in international adjudication, or locus standi for the protection of community interests.