Adam Grant: “As a social scientist, if I want to get a read on your personality, I could ask you to fill out a survey on how stable, dependable, friendly, outgoing, and curious you are. But I would be much better off asking your coworkers to rate you on those same traits: They’re up to 12 times more accurate. They can see things that you can’t or won’t – and these studies reveal that whatever you know about yourself that your coworkers don’t is basically irrelevant to your job performance.”