The reality in all this is that good teachers work many hours outside that “contract day” and are drastically underpaid to begin with. The bad ones really are overpaid. ...
If we want to attract and keep highly qualified teachers (real ones, not as defined by NCLB), we need to pay them appropriately, a view shared by a growing number of business leaders.
And we should differentiate between the best and worst to better compensate teachers who do the best job of educating kids.
See also Barnett Berry's take on what he calls the Manhattan Institute's cherry-picking data analyses.