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A Quick Look At The ASA Statement On Value-Added

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Good stuff. I agree with your #3 in particular. How can that be figured out? Would you support implementing a teacher evaluation system as an RCT, precisely to measure "the actions and dispositions of teachers, principals and other educators.” I.e., does teacher attrition rise or fall; what about morale via survey; what about total student achievement; what about quality of new teachers attracted (or not) to district?

Matt, For me, this was the big takeaway. I am surprised you did not mention it. "VAMs should be viewed within the context of quality improvement, which distinguishes aspects of quality that can be attributed to the system from those that can be attributed to individual teachers, teacher preparation programs, or schools. Most VAM studies find that teachers account for about 1% to 14% of the variability in test scores, and that the majority of opportunities for quality improvement are found in the system-level conditions. Ranking teachers by their VAM scores can have unintended consequences that reduce quality."

If you think VAM is potentially useful, isn't the burden of proof on VAM supporters not critics. Have you seen _any_ district avoid the serious issues you caution against?

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