For over a decade now, PISA scores have allowed international comparisons of student achievement but that was about it. One nation could be compared to the other, or at best subnations like Shanghai could (controversially) be compared. More recently, however, individual US states have started signing up for their own PISA scores -- FL, MA, and CT so far -- and OECD has developed a school-level version of the test called the OECD Test for Schools. That's right, a school-level PISA score (range, actually). Three hundred schools took it this year -- none in the Chicago area that I know of (it's confidential) -- and will get their scores back next month. Read all about it here (my latest article, in the Harvard Education Letter), and then let us know what you think. Link: Quietly, a New Test Gains Advocates. Will it help schools make further improvements, or devolve into yet another marketing and ranking exercise?