The value-added evaluations recently released from New York City schools harm teaching, says Linda Darling-Hammond, the Charles E. Ducommun professor of education at Stanford University and co-director of the Stanford Center for Opportunity Policy in Education. She writes that the evaluations, which have a high margin for error, do not reflect teachers' abilities or what students have learned. In addition, the test scores, which are the basis for value-added rankings, are determined by several factors, including students' home lives, health and attendance.

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