If schools and teachers are graded, we should be able to tell the "good" ones from the "bad" ones, right? After spending a year in a Texas high school former NY Times reporter Michael Brick says not so fast. "I came to understand the dangers of judging teachers primarily on standardized test scores. Raw numbers don’t begin to capture what happens in the classroom. And when we reward and punish teachers based on such artificial measures, there is too often an unintended consequence for our kids.