I think it should be in terms of how well they are achieving their mission. Which is kind of open ended and varies over time. But can be summed up as keep the W

I think it should be in terms of how well they are achieving their mission. Which is kind of open ended and varies over time. But can be summed up as keep the Web open and unrestricted. Their success can therefore be determined by how well they fight against things like: * monoculture of browser's/engine's (Internet Explorer, Webkit) * The use of vendor specific standards on web (ActiveX, NaCl, Flash Player) * The introduction and proliferation of non-open standards on the web. (H.264, HVEC, Widevine, Primetime, FairPlay, PlayReady) * The centralization of content and services onto a few dominant websites (Google, Facebook, YouTube)