[caption id="attachment_119168" align="alignleft" width="150"] The most reliable systems for measuring teacher effectiveness include a balanced mix of evaluation methods, researchers said—including student test scores, lesson observation, and student surveys.[/caption]

After three years of research on measuring teacher effectiveness, the Bill & Melinda Gates Foundation announced Jan. 8 that it takes multiple measures to most accurately evaluate teachers.

The Seattle foundation concluded in its final report on its Measures of Effective Teaching research that test scores or principal evaluations are not enough on their own. The findings mirror what teachers unions have been...

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