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researchers found they could pick out the best teachers in a school and even predict roughly how much their students would learn if they rated the educators through a formula that put equal weight on student input, test scores and detailed classroom observations by principals and peers

Judging teachers primarily by student performance on state tests, for instance, turned out to be highly unreliable, with little consistency from year to year. Judging them chiefly by a principal's observations failed to identify those teachers who could be counted on to boost student proficiency on state math and reading tests.

This should be a very big red flag to all those policy makers who think they can have test-based accountability be half or more of a teacher's evaluation