schools. some of them are regular public schools. some of them are private schools. but the schools that are better have high expectations for their kids. they have accountability and flexibility for their teachers. and they are allowed to manage their personnel in a way that makes them be effective, because the people in the building are the most important factors to making a school successful. and the schools that are successful are able to manage the people in their build effectively. >> larry: michelle, how do we judge a teacher? >> well, you know, there's a question right now about this. and lots of people say, well, it's impossible to measure teacher effectiveness, but we disagree. so we have completely revamped teacher evaluation in the district of columbia. and what we've said is that 50% of the teacher's evaluation is based on their student academic growth. so kids start out at point "a." how far do they grow compared to where we expected them to be. >> larry: well, if the teachers know that, they give more bs. >> no, no.