He then proposes that the computer can offer a solution to that challenge, in that computers can offer simulations, thereby enabling learning by doing. You must internalize procedures to do a better job. To do this you must try them out and receive help when you fail. If you didn't practice that technique over and over again, you wouldn't remember it for long. In essence, Schank is advocating learning through failure, and also, learning by doing.
People learn from their failures.
A realistic computer simulation will allow for this type of learning. This view exists in contrast to the school model, which usually equates failure with punishment. Rather, Schank believes we should embrace failure - and use it as an opportunity to learn. Again, he is advocating learning by doing. This is very difficult to do in a teacher situation.