most but a debate about how you measure quality and the testing. i want to read you something from a report, the research arm of the michigan education association which to be clear is the teachers union but they say u.s. states with high academic standards fare no better or worse than those identified as having low standards. research support for standards driven test based accountability systems is similarly weak and nations with centralized standards generally tend to perform no better or worse on international tests than those without. essentially they're challenging this idea that the white house is for, that you are for, that we need to go to this test-based system. >> we don't just look at test scores. we look at test scores as part of the entire picture so 50% of the teacher's evaluation is based on how much students grow, not an absolute mark but how much they grow over the course of the year. 40% is based on observations of their classroom practice. and we observe them five times in the year. two of those observations are completed by external evaluators. we look at how much contribution the teacher makes to the overall