A Few Additional Points About The IMPACT Study

Matthew DiCarlo:

The recently released study of IMPACT, the teacher evaluation system in the District of Columbia Public Schools (DCPS), has garnered a great deal of attention over the past couple of months (see our post here).

Much of the commentary from the system's opponents was predictably (and unfairly) dismissive, but I'd like to quickly discuss the reaction from supporters. Some took the opportunity to make grand proclamations about how "IMPACT is working," and there was a lot of back and forth about the need to ensure that various states' evaluations are as "rigorous" as IMPACT (as well as skepticism as to whether this is the case).

The claim that this study shows that "IMPACT is working" is somewhat misleading, and the idea that states should now rush to replicate IMPACT is misguided. It also misses the important points about the study and what we can learn from its results.

First, to reiterate from our first post about the study, the analysis focuses solely on the teachers who are near the minimally effective (ME) and highly effective (HE) cutoff points. It is not an "overall" assessment of the system, as there is no way to know how teachers who are not close to these thresholds (i.e., the vast majority of teachers) are responding to the system. And improvement among all teachers is an extremely important outcome (as is how the system might affect the teacher labor supply).

Posted by Jim Zellmer at December 7, 2013 12:50 AM
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