Self-discipline matters more than IQ

An American study has found that a school pupil's self-discipline is a stronger predictor of their future academic success than their IQ, leading researchers to conclude that self-discipline may be the "royal road" to building academic achievement.

In a first study, Angela Duckworth and Martin Seligman (Positive Psychology Centre, University of Pennsylvania) recruited 140 school children (average age 13 years) at the start of the academic year.

In the Autumn, the children, their parents and teachers, all completed questionnaires about the children's self-discipline. The measures asked things about the children's ability to follow rules, to avoid acting impulsively, and to put off instant rewards for later gratification. Scores from the different measures were combined to create an overall indicator of self-discipline.

The researchers found self-discipline predicted all sorts of academic measures taken seven months later, including the children's average grade for the academic year, their Spring exam result and their selection into High School.

A second study with 164 children (average age 13) followed a similar procedure but also involved the children taking an IQ test in the Autumn. Self-discipline again predicted later academic performance, as measured by their average grade for the year and their Spring exam result.

Moreover, the researchers found that the children's self-discipline scores accounted for twice as much of the variation in their later academic performance as their IQ did.

The researchers said "Underachievement among American youth is often blamed on inadequate teachers, boring textbooks, and large class sizes. We suggest another reason for students falling short of their intellectual potential: their failure to exercise self-discipline".

References

Duckworth, A.L. & Seligman, M.E.P. (2005). Self-discipline outdoes IQ in predicting academic performance of adolescents. Psychological Science, 16, 939-944.