Laura Chapman: Can Teachers Be Measured by the Same Methods Used for Cows?

Diane Ravitch's blog

Our wonderful reader Laura Chapman reports here on the origins of the laws that purport to measure teacher quality by the test scores of their students. The founding father of this methodology was the late William Sanders, an agricultural statistician who believed that the same productivity used to measure cows could be used to measure teachers. His ideas were adopted and promoted by Arne Duncan’s Race to the Top, which required states to adopt “value-added methodology” if they wanted to compete for a share of billions of federal dollars. The Gates Foundation also embraced test-based accountability. These methods proved to be ineffective at measuring teacher quality; they are inaccurate and demoralizing.

According to a 2019 report coauthored by Audrey Amrein-Beardsley, 15 states are still inflicting teacher evaluations by VAM (value added measures) and 28 are using the equally invalid process of writing up Student Learning Objectives (SLOs). SLOs require you…

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