Jason Glass said:
For a policy that practically every public school system in the nation is pursuing, the lack of evidence to support [the] effectiveness [of using student test scores to rank and evaluate teachers] is staggering. The number of high-performing education systems that use such an approach: zero. The number of peer-reviewed scientific studies that support this approach: zero.
via http://www.vaildaily.com/opinion/12964448-113/education-quality-system-systems
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