If he is good, he can reason about it on the spot. If he can't, I very much doubt that he can design anything excellent. That requires critical thinking to unde

If he is good, he can reason about it on the spot. If he can't, I very much doubt that he can design anything excellent. That requires critical thinking to understand what it is being used for, what is good, and importantly what solutions are unsuitable for the problem he is trying to solve.