It has long been known that if you want the highest possible achievement, split up students along ability lines (even if that means starting to ignore age). Th

It has long been known that if you want the highest possible achievement, split up students along ability lines (even if that means starting to ignore age). That will produce the highest highs. This has been known for centuries. Everyone in education will have been taught this. The point of the administrators effort was not to improve students' outcomes ... and that means that, despite failure, it's probably not over. This saves money.