When researchers studied an incoming class of cadets at West Point, they measured their grade point averages, physical aptitude, military abilities, and self-discipline. When they correlated those factors with whether students dropped out or graduated, however, they found that all of them mattered less than a factor researchers referred to as “grit,” which they defined as the tendency to work “strenuously toward challenges, maintaining effort and interest over years despite failure, adversity, and plateaus in progress.