This article discusses the teacher turnover rate in one group of New York City schools; many of the teachers are either being fired or resigning for their own reasons. While it is definitely important to have the best teachers possible in the classrooms, it seems that schools might not be going about this in the best way possible for the teachers or the students.

Edward, I completely agree with your image of a "bad" teacher and I honestly have never seen one myself either! I know some that might be a little burnt out, but they are still trying their best and doing everything they can to teach their students. I realize that this must not be the case in every school, or at least I am assuming there must be some really "bad" teachers out there since everyone seems to be so eager to get rid of them! And yes, your point about the bottom third is also important--even if every teacher in the school is working hard and doing their best, there still has to be a bottom third that will get fired...