As many states and districts rethink teacher supervision and evaluation, the team at the Measures of Effective Teaching (MET) Project, funded by the Bill and Melinda Gates Foundation, has analyzed thousands of lesson videotapes and studied the shortcomings of current practices. The tentative conclusion: Teachers should be evaluated on three factors--classroom observations, student achievement gains, and feedback from students. The use of multiple measures is meant to compensate for the imperfections of each individual measure and produce more accurate and helpful evaluations (Kane & Cantrell, 2012). This approach makes sense, but its effectiveness will depend largely on how classroom observations, achievement data, and student feedback are used. As states and districts rethink their teacher evaluation policies, the author urges them to consider the enhancements to classroom observations, the use of achievement data, and student input that he suggests in this article. He believes these practices will give teachers a stronger voice, use principals' time more effectively, and make teacher evaluation a real player in dramatically improving teaching and learning.