Letter offers a warning on the unreliability of value-added evaluations

05/23/2011 | Washington Post, The

Washington Post education writer Valerie Strauss shares a letter in this blog post that 10 assessment experts sent to the New York State Board of Regents, expressing their concern about linking student test scores to teacher evaluations and the unreliability of value-added systems. Strauss says the letter was ignored in the board's decision to use test scores for 40% of educator evaluations. The letter states that value-added data is flawed, unstable, unreliable and does not take a myriad of factors into account, such as the effects of other teachers and influences outside of school.

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