It indeed relates to the measure of damages. That is a good thing since this most likely means that the arbitrators have decided liability and jurisdiction in favor of GRZ. In other words, there would be no reason to consider quantum (i.e. damages) if they had not found that Vz was liable. However, that is not always the case. Here's a decent primer on quantum issues in arbitration cases. http://www.kslaw.com/imageserver/KSPublic/library/publication/Quantum-Quarterly-Q4-2010.pdf Also, it appears that ICSID requests for more evidence on quantum issues is not that uncommon. Google quantum issues ICSID and you'll see what I mean.