>It's not clear if the study referenced controlled for student variance this way; if so, it would readily explain the lack of results. This headline is pretty

>It's not clear if the study referenced controlled for student variance this way; if so, it would readily explain the lack of results. This headline is pretty click baity. A “better” teacher is one the produces better outcomes for their students. Firing the “bad” teachers, and rewarding the “good” teachers will obviously lead to better outcomes for students. This experiment was only testing whether the metrics they were using truly measured the quality of the teachers, and whether their insentive structure was productive. Turns out they weren’t.