Of course, those systems [that link student achievement to teacher performance] need to be sensible and fair. But the country will never get where it needs to be if we take the approach — as union leaders have sometimes done — that student test scores should be out of bounds when it comes to judging teacher effectiveness. That is an indefensible position. The unions can either help to create this system, or get left behind.

Today’s New York Times editorial, “Accountability in Public Schools.” Hey, it’s almost starting to feel like a movement.