Tricia also put up a measure of national participation in international educational tests.
It is a neat idea that Chiqui mentioned a while back. We didn’t discuss it extensively, but I think the idea was that participation in the IEA testing regime might affect national educational policies. Participating in testing activates a sense of competition — putting nations in more of a ‘horesrace’ mentality. And, it stratifies nations, which facilitates copying/diffusion. You know who is ‘winning’ and might choose to emulate them.