Transfer must be the aim of all teaching in school - it is not an option - because when we teach, we can address only a relatively small sample of the entire subject matter. All teachers have said to themselves after a lesson "Oh, if only we had more time! This is just a drop in the bucket!" We can never have enough time. Transfer is our greatest and most difficult mission because we need to put students in a position to learn far more, on their own, than they can ever learn from us.