Sixteen rigorous studies of thousands of people at work have shown that people’s coworkers are better than they are at recognizing how their personality will affect their job performance. 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 often more than twice as 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.
Humans’ blind spots are predictable: There are certain types of traits where people can’t see themselves clearly, but others where they can. The psychologist Simine Vazire asked people to rate themselves and four friends on a bunch of traits, ranging from emotional stability and intelligence to creativity and assertiveness. Then, to see if they had predicted their own personalities better than their friends had, they took a bunch of tests that measured these traits.
The good news: You have some unique insight into your emotional stability. In the study, people outperformed their friends at predicting how anxious they’d look and sound when giving a speech about how they felt about their bodies. But they did no better than their friends (or than strangers who had met them just eight minutes earlier) at forecasting how assertive they’d be in a group discussion. And when they tried to predict their performance on an IQ test and a creativity test, they were less accurate than their friends.