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The Gates Foundation's latest report from its teacher-effectiveness study concludes that many evaluation models can be useful as long as they include multiple measures.

Now that the city and teachers union are back at the negotiating table to work on teacher evaluations, the Gates Foundation has some tips.

The foundation today released the third and final report about the Measures of Effective Teaching project, an ambitious three-year study that included 3,000 teachers in seven districts, including New York City. The study concludes that teacher effectiveness can indeed be measured and identifies strategies for grading teachers.

Having multiple people observe the same teacher is more effective than having one person observe the teacher multiple times, the study found. Student surveys are stronger predictors of teachers’ ability to raise test scores than observations. And counting state test scores for a third to half of a teacher’s rating is better than weighting the scores less or more.

With the report, the foundation takes a bold stance on a policy issue that remains hotly contested, even as states and school districts across the country have adopted new evaluation systems. But foundation officials are confident because the latest report reflects a change in the study’s design that they say proves that teacher evaluation systems really do measure teachers. (more…)