Teacher observations have become a national education phenomenon, mandated by federal policies and promoted by philanthropists. They are crucial components of teacher evaluation systems that often have high stakes for teachers and school systems, but have sparked little innovation. Recent calls to make teacher evaluations better, faster, and…

The authors report on three experiments designed to (a) test under increasingly more favorable conditions whether judges can correctly rate teachers of known ability to raise student achievement, (b) inquire about what criteria judges use when making their evaluations, and (c) determine which criteria are most predictive of a teacher's…