The lack of evidence supporting the use of student test scores to rank teachers is staggering

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