The conventional view is that the origin of the black-white student achievement gap can be traced to sociocultural and socioeconomic factors, plus variation in parental style and parental investment, and is maintained and perpetuated by variation in school and teacher quality. This article rejects the conventional view, drawing upon the results of…

We apply "value-added" models to estimate the effects of teachers on an outcome they cannot plausibly affect: student height. When fitting the relatively simple models that are widely used in educational practice to New York City data, we find the standard deviation of teacher effects on height is nearly as large as that for math and…

The growing availability of data linking students to classroom teachers has made it possible to estimate the contribution teachers make to student achievement. While there is a growing consensus that teacher quality is important and current evaluation systems are inadequate, many have expressed concerns over the use of value-added measures (VAMs)…