Should teachers be paid based on student performance?

I do think that teachers should be paid based on student performance, but the performance should not be based on test scores.  I think that a teachers job is to help students grow throughout the year, and the teacher should be able to show a students' progress through conference notes and assessments.  I do not like the idea of teachers getting raises because of high state test scores, because to me, that doesn't show much.  Every student tests differently, and you may have students in your class with learning disabilities that can bring your class average down so I don't think that is a fair judge of progress.