New York City collecting data on teacher performance

New York City has embarked on an ambitious experiment, yet to be announced, in which some 2,500 teachers are being measured on how much their students improve on annual standardized tests. The move is so contentious that principals in some of the 140 schools participating have not told their teachers that they are being scrutinized based on student performance and improvement.

While officials say it is too early to determine how they will use the data, which is already being collected, they say it could eventually be used to help make decisions on teacher tenure or as a significant element in performance evaluations and bonuses. And they hold out the possibility that the ratings for individual teachers could be made public.

The effort comes as educators nationwide are struggling to figure out how to find, train and measure good teachers. Many education experts say that until teacher quality improves in urban schools, student performance is likely to stagnate and the achievement gap between white and minority students will never be closed. Read more in The New York Times online.