It would be very interesting to know how Google measures on-the-job performance since you obviously can't talk about correlation without numbers backing it up.

It would be very interesting to know how Google measures on-the-job performance since you obviously can't talk about correlation without numbers backing it up. I seem to recall having read that on-the-job-performance is not as easily measurable than Norvig seems to imply but I guess that if they successfully managed to reach this Holy Grail they probably won't share the numbers, even less the methods.