Turning the Tables: VAM (Value Added Models) on Trial

David Cohen:

Los Angeles Unified School District is embroiled in negotiations over teacher evaluations, and will now face pressure from outside the district intended to force counter-productive teacher evaluation methods into use. Yesterday, I read this Los Angeles Times article about a lawsuit to be filed by an unnamed "group of parents and education advocates." The article notes that, "The lawsuit was drafted in consultation with EdVoice, a Sacramento-based group. Its board includes arts and education philanthropist Eli Broad, former ambassador Frank Baxter and healthcare company executive Richard Merkin." While the defendant in the suit is technically LAUSD, the real reason a lawsuit is necessary according to the article is that "United Teachers Los Angeles leaders say tests scores are too unreliable and narrowly focused to use for high-stakes personnel decisions." Note that, once again, we see a journalist telling us what the unions say and think, without ever, ever bothering to mention why, offering no acknowledgment that the bulk of the research and the three leading organizations for education research and measurement (AERA, NCME, and APA) say the same thing as the union (or rather, the union is saying the same thing as the testing expert). Upon what research does the other side base arguments in favor of using test scores and "value-added" measurement (VAM) as a legitimate measurement of teacher effectiveness? They never answer, but the debate somehow continues ad nauseum.

It's not that the plaintiffs in this case are wrong about the need to improve teacher evaluations. Accomplished California Teachers has published a teacher evaluation report that has concrete suggestions for improving evaluations as well, and we are similarly disappointed in the implementation of the Stull Act, which has been allowed to become an empty exercise in too many schools and districts.

Much more on "value added assessment", here.

Posted by Jim Zellmer at February 7, 2012 2:27 AM
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