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 recently released from the Bill & Melinda Gates Foundation. A composite measure on teacher effectiveness drawing on all three of those measures, and tested through a random-assignment experiment, closely predicted how much a high-performing group of teachers would successfully boost their students' standardized-test scores, concludes the series of new papers, part of the massive Measures of Effective Teaching (MET) study launched more than three years ago. Taken as a whole, the final MET findings provide much food for thought about how teacher evaluations might best be structured.