I think I see what you mean. I didn't mean memorizing vocabulary per se (Guessing the Teacher's Password), but getting to practice old concepts and apply them to new problems. There's a tendency to forget conceptual processes if they're not used. An important aspect of education is that it's remembered, in general. To use an example, I'd sure like it if I remembered most of what I learned in Bio II, or psychology I, and so forth. I mastered those courses at the time, but I've forgotten them, so it's as if I wasn't educated. I suppose, there's a fine line between mastery and memorization, but mastery, I should think, is the combination of real understanding and recall. One cannot exist without the other.