From Ed Week : Student feedback, test-score growth calculations, and observations of practice appear to pick up different but complementary information that, combined, can provide a balanced and accurate picture of teacher performance, according to research released today by the Bill &Melinda Gates Foundation. The $45 million study, in progress since 2009, is one of the largest and most extensive research projects ever undertaken on the question of how to identify and measure high-quality teaching. It involved some 3,000 teachers in six districts: Charlotte-Mecklenberg, N.C.; Dallas; Denver; Hillsboro County, Fla.; Memphis, Tenn.; and New York City. To the amazement of all: Basing more than half a teacher’s evaluation on test-score-based measures of student achievement seemed to compromise it, the researchers also found. Another piece suggests that teachers should be observed by more than one person to ensure that observations are reliable. ...