The way DCPS tells teachers it assesses their "value-added" contribution is idiotic!
If Aaron Pallas doesn't know that the actual assessment is completely different than what is described to teachers, he's an idiot!
Or, to go back to an earlier post by Pallas on the subject:
What is troubling to me is that, to date, districts using these complex value-added systems to evaluate teacher performance haven’t made the methodologies known to the general public.
Hess's "rebuttal" only confirms Pallas's actual point. Pallas set a rhetorical trap, and Hess fell right in.