Advocates of the value-added model to evaluate teachers justify their position by claiming that is how business works. Yet all prospectuses of mutual funds warn in bold letters that past performance is no guarantee of future results.
If that is the case, then why are students' scores on state tests in one year used as the basis to predict their likely scores on state tests at the end of the subsequent year to establish the value added by teachers? The flagrant double standard would be risible if it did not carry such serious consequences.
Letters - Back to School - Grading the Teacher - NYTimes.com
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