That concept has a name, the "zone of proximal development", which is "the level of difficulty ... that is neither too hard nor too easy, and is the level at wh

That concept has a name, the "zone of proximal development", which is "the level of difficulty ... that is neither too hard nor too easy, and is the level at which optimal learning takes place": http://en.wikipedia.org/wiki/Zone_of_proximal_development http://en.wikipedia.org/wiki/Zone_of_proximal_development