International investment law has received increasing attention due to the proliferation of investment treaties and the number of arbitral awards made thereunder. At the end of 2011, there were 450 known investment cases that have been settled or are pending. Yet, there are many core questions...

In the past, concerns have been expressed about the secrecy of international treaty arbitration. This paper attempts to show how the investment treaty arbitration system has responded to these criticisms. It starts by reviewing the arguments in favour of transparency and what different forms...