Gotta love Alfie Kohn, and in this Huffington Post article he clearly illustrates the problems with the value added (meaning increased test scores) approach to evaluating teacher performance. But Kohn’s article also points out common misconceptions in many evaluation contexts, like uniformity is the same as quality and value is easily perverted or narrowed by the indicators selected.
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Check out Ken Saltman’s piece in Truthout re value-added assessment
http://www.truth-out.org/value-added-assessment-tool-improvement-or-educational-nuclear-option63244