Public school teachers, like anyone else in the workforce, should have their job performance regularly evaluated. No one is suggesting otherwise. How to get that done fairly, though, is another issue. Take the case of Sheri G. Lederman, for instance. She has taught fourth grade for 17 years in New York’s Great Neck Public School district. She is, by most standard measures, an extraordinary teacher. However, the state of New York now considers her “ineffective” because, as The Washington Post reported, the value-added model (or VAM)...
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