Grit: The Power of Passion and Perseverance · chapter 13 · id grit-c13-01-grit-is-a-meaningful-distinct-

“Grit is a meaningful, distinct psychological construct that predicts success across diverse domains, and it can be developed through deliberate effort.”

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Crede et al. (2017), JPSP 113(3), 492-511source alive

Based on 88 samples (N = 66,807): grit is very strongly correlated with conscientiousness; the higher-order structure is not confirmed; grit's incremental validity over conscientiousness is minimal; interventions to enhance grit may only have weak effects.

Rimfeld et al. (2016), JPSP 111(5), 780-789source alive

Grit is 37% heritable, genetically nearly identical to conscientiousness (rG = .86), shows zero shared environmental influence, and adds only 0.5% to academic prediction beyond Big Five.

Gonzalez et al. (2020), Journal of Research in Personality 89paywalled — manual check queued

Grit and conscientiousness: Another jangle fallacy.

Sisk et al. (2018), Psychological Science 29(4), 549-571DOI registry: valid

Growth mindset interventions (which Duckworth links to grit development) showed d = 0.08 effect sizes.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.