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Modern international law is composed to a great extent of treaty-based sub-systems. Very often, these systems interact with each other and may give rise to a conflict. The lack of hierarchy in public international law (with the exception of jus cogens) and clear rules on how its norms interact have raised several very important questions. Questions, related to the interplay between different treaty regimes and between treaties and custom, or treaties and general principles of law. Although those problems are omnipresent within the framework of the WTO, which interacts with almost all other rules of international law, and whose dispute settlement mechanism is probably the most frequently applied multilateral system for the legal settlement of disputes among governments, those questions have been desperate to find an answer. The purpose of this work is to illuminate the extent to which Panels and the Appellate Body may apply rules and principles of international law deriving from sources other than the WTO covered agreements.

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Vanya has received her LL.M. in Foreign Trade and European Economic Law from the Law School at the Europa-Institut of Saarland University in 2009.Since then she has build a background in US State government regulation and EU programs for economic development. She is currently the founder and CEO of Eventase.

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