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Abstract
This thesis analyzes in a comprehensive and systematic manner the principle of res judicata in international law, thereby clarifying all relevant aspects of a rule that constitutes one of the cornerstones of international dispute settlement, while proposing solutions to various practical and theoretical problems that have existed to date. The thesis focuses notably on addressing core issues such as the sources and nature of res judicata as a rule of international law; the constitutive element of the principle and its personal and material scope; the proper methodology for its application in specific cases; the legal effects of the principle, as well as the consequences of its misapplication; the exceptions to res judicata; particular issues concerning the scope of res judicata; and other means available at the international level to achieve finality in dispute settlement.