There are many portions of Arne Duncan's educational policies that are... what's the word? Counter-intuitive? Baloney? There are days when I imagine that the energy Duncan expends just holding cognitive dissonance at bay must be enough to power a small country.
In concept, evaluating teachers makes perfect sense. In what private company are employees not evaluated and held accountable for their contribution to their company's bottom line? In practice, evaluating teachers is not so easy.