I was a public school teacher that worked in a district that attempted to measure teacher value add. There was limited pay for performance based on that metric. And the district I worked in was majority racial minority and majority living in poverty. "Using the expiration of preexisting collective bargaining agreements as a source of exogenous variation in the timing of changes in pay, I show that the introduction of…
What if the standardized tests aren't administered by the teacher? That seems like it would be an easy solution to get around the cheating problem. As for teaching to the test, what's the real downfall of doing that? Colleges use standardized test scores as the biggest or one of the biggest criteria in admission.
In order for the test scores to be granular enough to be used as measure of performance of individual teachers, the testing would have to be done fairly often. The schools and school districts that are already lacking funds for basic stuff like maintenance and teacher and staff salaries would have hard time to pay an additional subject to administer the test.
With the frequency and volume of testing, it would likely be too costly to do the testing in an external testing facility (which most districts do not have), so it would have to be done on site. I remember my kids telling me that every time before they took a standardized test (it happens once a year around here), the teachers told them basically "we cannot give you the answers, but look around, the answers may already be there, there may be a poster hanging on the wall or something else like that that may be helpful."