Current Developments

Zwischen Skylla und Charybdis

Die Kollision von völkerrechtlichen Intra-EU-BITs mit dem Unionsrecht

Die Straßen rund um das Plateau Kirchberg im Osten Luxemburgs, quasi der Herzkammer der europäischen Rechtswissenschaft, sind schon seit mehreren Jahren eine Dauerbaustelle. Am Montag, den 19. Juni 2017, war vielen im Luxemburger Europaquartier jedoch klar, dass die vielleicht größten Baustellen hinter den Türen des Boulevard Konrad Adenauer liegen. Die Vereinbarkeit des Unionsrechts mit den Schiedsgerichtsverfahren ist nicht erst seit den Diskussionen um die Freihandelsabkommen CETA und TTIP ein Dauerbrenner …


Alternative Dispute ResolutionDiscussionResponseSymposium

Investor-state arbitration: rationale and legitimacy

A reply to Christian Tietje Attempts to conceptualize the foundations of and crucial questions around investment arbitration are most welcome, as the field gains not only public attention, but also increasing importance for investors as well as receivers. Christian Tietje, claiming in the title that investor-state arbitration is a part of the international rule of law and, therefore, a mechanism for upholding it, touches on what may surely be called …


Alternative Dispute ResolutionDiscussionKick-offSymposium

Investor-State Arbitration as Part of the International Rule of Law

Investor-state arbitration is not only the most heated topic discussed in international economic law, but it also has become an important political issue more generally. Indeed, it is amazing to see how a topic that, some years ago, interested only a handful of international economic lawyers and very few academics has emerged today as an issue on which everybody has an opinion. Moreover, there seems to be only one direction …



Towards an Integrated, Predictable and Coherent International Legal System: A Defence of Proportionality Balancing

A response to Sué González Hauck Johann Ruben Leiss In her post Sué González Hauck provides a thoughtful and critical perspective on proportionality balancing as a means to overcome fragmentation in international law. In my view, however, her perception overburdens proportionality balancing with assumptions and expectations that do not reflect its character. I will first lay out the understanding of proportionality which this comment relies on, before then discussing the arguments …



A Critique of Proportionality Balancing as a Harmonization Technique in International Law

Since the publication of the Fragmentation Report by the International Law Commission, international legal scholars and practitioners alike seem to be less concerned about the theoretical questions raised by the fragmentation debate. Instead, they have turned to identifying and examining tools which could avoid or resolve normative conflicts between norms of different specialized areas of international law (also referred to as “regimes”). Proportionality balancing is one of these tools of …