Another tricky issue is what to do about teachers' aides, special ed aides, handicapped students' companions, and other adults who might be in the classroom with the teacher. The more adults the better (hopefully), but not all adults are of equal value to the teacher. Under a value-added system of pay, teachers will finagle even more than now to get the most useful aides in their classrooms. Those who win the political battles for the most and best aides will get paid more unless the aides' inputs can be taken into account.