From Business Insider —

“In a paper, “Self-Discipline Outdoes IQ In Predicting Academic Performance Of Adolescents,” Duckworth and colleague Martin Seligman tested 164 eighth graders “recruited from a socioeconomically and ethnically diverse magnet public school” in the Northeast for self-discipline and IQ. They measured the students in the fall and spring through self-assessment, a behavioral delay-of-gratification task, and a survey of study and lifestyle habits, along with a group IQ test. They found that “self-discipline predicted academic performance more robustly than did IQ. Self-discipline also predicted which students would improve their grades over the course of the school year, whereas IQ did not.”

This chart shows their findings about self-discipline vs IQ:

IQ measurement

Read the full story at ‘Grit’ Is More Important Than IQ