<p>“Across six studies, individual differences in grit accounted for significant incremental variance in success outcomes over and beyond that explained by IQ, to which it was not positively related. As summarized in Table 3, grit accounted for more variance in outcomes than commonly observed for Big Five Conscientiousness. In Studies 1 and 2, we found that grittier individuals had attained higher levels of education than less gritty individuals of the same age. Older individuals tended to be higher in grit than younger individuals, suggesting that the quality of grit, although a stable individual difference, may nevertheless increase over the life span. As we expected, grittier individuals made fewer career changes than less gritty peers of the same age. In Study 3, undergraduates at an elite university who scored higher in grit also earned higher GPAs than their peers, despite having lower SAT scores. In Studies 4 and 5, grit was a better predictor of first summer retention at West Point than was either self-control or a summary measure of cadet quality used by the West Point admissions committee. However, among the cadets who persisted to the fall semester, self-control was a better predictor of academic performance. In our final study, grittier competitors in the Scripps National Spelling Bee outranked less gritty competitors of the same age, at least in part because of more accumulated practice.”</p>
<p>Source: Duckworth, A. L., Peterson,C., Matthews, M.D., & Kelly, D. R. (2007). Grit: Perseverance and passion for long term goals. Journal of Personality and Social Psychology, 92.</p>