Climate of disrespect for teachers gets worse - The Answer Sheet - The Washington Post: "The Chicago Tribune’s editorial board has now urged Illinois parents to demand that the state emulate New York City (and Los Angeles) by making individual teachers’ “value-added” ratings available for public scrutiny.
For those not versed in the latest trend in educational accountability, “value-added” formulas are complex statistical calculations that attempt to isolate a teacher’s impact on a student’s growth — as measured by gains on standardized test scores. In essence, value-added measures try to show how much of a student’s test score increase can be chalked up solely to the influence of their teacher.
If that sounds tricky and imprecise, that’s because it is — and there’s no research to show that value-added models have done anything to help teachers improve, or to help kids learn.
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