"The usual procedure is that when anything happens, [we] suppose that somebody did it. Who did it? Pin a necklace on him. He's our culprit. He's the one who did it. That's wrong, entirely wrong. Chances are good, almost overwhelming, that what happened, happened as a consequence of the system that he works in, not from his own efforts. In other words, performance cannot be measured. You only measure the combined effect of the system and his efforts. You cannot untangle the two. It is very important, I believe, that performance cannot be measured."