Better teacher evaluation should lead to better instruction and improved outcomes for students, but more accurate classification of teachers requires better information than is now available. Because existing measures of performance are incomplete and imperfect, measured performance does not always reflect true performance. Teachers who are truly…

Fifty years after the release of "Equality of Educational Opportunity"--widely known as the Coleman Report--much of what James Coleman and his colleagues reported holds up well to scrutiny. It is, in fact, remarkable to read through the 700-plus pages and see how little has changed about what the empirical evidence says matters. The…