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Standard Tests Do Reveal Which Teachers Are Best

March 13 (Bloomberg) -- Improving the quality of education delivered through our public schools can not only boost economic growth but also help to narrow income inequality in the U.S. And the best way to improve education is to identify and promote the most talented teachers.

One way of measuring a teacher’s effectiveness has been to see how much his or her students’ test scores rise. This kind of “value added” measure is straightforward and can easily be used to weed out bad teachers and promote better ones.