The interpretation of treaties by foreign investment arbitral tribunals

Abstract

This thesis explores the rules of treaty interpretation as they are applied by foreign investment arbitral tribunals (“FIATs”). Its primary aims are: a) to determine whether FIAT treaty interpretation practice is generally consistent with other international courts and tribunals; b) to assess whether the treaty interpretation rules contained in the 1969 Vienna Convention on the Law of Treaties (“Vienna Convention”) are suitable for application in investor-State treaty disputes; and c) to evaluate the contribution of FIAT treaty interpretation jurisprudence to international law. The body of the thesis provides a background to treaty interpretation rules in international law and then examines in detail the application of the rules of interpretation contained in the Vienna Convention by both international courts and tribunals and FIATs. It also explores modes of interpretation that have been deployed by these two groups which are not explicitly referenced in the Vienna Convention. Investigation is also made of some unique or notable aspects of FIAT jurisprudence that relates to treaty interpretation. The research was carried out primarily through the analysis of international court and tribunal decisions and FIAT awards. The principal findings of the thesis are that: a) a general congruence exists between the interpretative practice of FIATs and that of other international courts and tribunals; b) the application of the Vienna Convention rules on treaty interpretation are suitable for investment treaty arbitration, with some exceptions, e.g., in situations where investors have vastly disproportionate access to the preparatory work of treaties as compared with respondent States; and c) FIATs have made a significant contribution to the international law of treaty interpretation.