Academic Performance: The Role of Grit Compared to Short and Comprehensive Inventories of Conscientiousness

Grit has been suggested as a predictor of academic success over and above established constructs like conscientiousness (C) but has only been compared to brief inventories of trait-level C. This study examined the difference between using a brief inventory of C (Big Five Inventory [BFI]) and a facet-level inventory (NEO Personality Inventory–Revised [NEO PI-R]) as controls for grit in an undergraduate sample (N = 1,394). Grit exhibited strong correlations with C, particularly the facets of self-discipline and achievement striving. When BFI was used, both grit and C added small increments in explained variance while controlling for each other. When NEO PI-R was used, grit could not explain any additional variance in university grade and minuscule amounts (4%) in high school grade. Facets of C added moderate amounts (16%–54%) of incremental variance to both university and high school grades when controlling for grit. The results demonstrated that different outcomes are to be expected depending upon the choice of C measure.