Comparing Teacher And Principal Evaluation Ratings
The District of Columbia Public Schools (DCPS) has recently released the first round of results from its new principal evaluation system. Like the system used for teachers, the principal ratings are based on a combination of test and non-test measures. And the two systems use the same final rating categories (highly effective, effective, minimally effective and ineffective).
It was perhaps inevitable that there would be comparisons of their results. In short, principal ratings were substantially lower, on average. Roughly half of them received one of the two lowest ratings (minimally effective or ineffective), compared with around 10 percent of teachers.
Some wondered whether this discrepancy by itself means that DC teachers perform better than principals. Of course not. It is difficult to compare the performance of teachers versus that of principals, but it’s unsupportable to imply that we can get a sense of this by comparing the final rating distributions from two evaluation systems.
These are different, completely untested systems measuring different jobs. Moreover, the principal evaluations (appropriately) employ different measures than those used for teachers, and they are combined in a different way. For instance, principals can only be rated effective if they meet their proficiency targets in either math or reading and “make gains” in the other. (Side note: Cross-sectional proficiency gains are a terrible measure that, in my view,