Many people assume that it's possible for a person to be an effective leader without being likable. That is technically true, but you may not like the odds. In a study of 51,836 leaders, we found just 27 who were rated at the bottom quartile in terms of likability but in the top quartile in terms of overall leadership effectiveness — that's approximately one out of 2,000.

Our likability index, based on data collected from 360 assessments, measures a broad set of behaviors that go far beyond smiling and having a pleasant personality. To see the complete list, and take a self-assessment of your personal likability, click here.

To read the original article: I'm the Boss! Why Should I Care If You Like Me? - Jack Zenger and Joseph Folkman - Harvard Business Review