http://www.youtube.com/watch?v=oeXoOkU5PjQ http://www.youtube.com/watch?v=oeXoOkU5PjQ Partitioning probably works because it groups kids such that in each abil

http://www.youtube.com/watch?v=oeXoOkU5PjQ http://www.youtube.com/watch?v=oeXoOkU5PjQ Partitioning probably works because it groups kids such that in each ability group they are at or near the region of maximum Shannon information density in the feedback they're receiving.