This Chapter outlines the context, objective, and scope of the book, and examines two foundational issues that anchor its law of the sea enquiry firmly within the doctrinal and methodological context of general international law. First, it considers the international law concept of ‘jurisdiction’ and examines its role and application under the 1982 United Nations Convention on the Law of the Sea in general, and in the exclusive economic zone (EEZ) in particular. It explores the idea of jurisdiction as a ‘continuum’ of prohibitions, rights, and obligations pursuant to which a State may be obliged, authorized but not required, or prohibited from exercising authority in relation to a person or activity, and considers the balance of interests in the sui generis regime that underpins the jurisdictional continuum of the EEZ. Second, it examines the potential legal effects of subsequent State practice in the law of the sea. It describes the conceptual framework that underlies the book’s widespread examination of State practice and explains how the relevant rules of international law apply to evaluate the legal effect of State practice under treaty law and customary international law in the unique context of the law of the sea. The Chapter outlines the parameters used to determine and analyse the State practice examined in the book, and concludes with an overview of the structure and chapter content.