Much Ado About Grit: A Meta-Analytic Synthesis of the Grit Literature

Meta-analysis of 88 studies showing grit's correlation with performance is modest (r ≈ .18) and that grit overlaps substantially with conscientiousness — particularly the perseverance facet. The hierarchical structure of grit-as-distinct-construct is not well supported.

Empirical pressure on the trait-as-virtue framing. If grit's predictive power is modest and largely subsumed by an existing Big Five facet, the popular case for grit-as-leverage weakens. This converges with the framework's read: persistence is trait-channeled and situation-dependent, not a generic capacity that can be 'developed' independent of alignment.

Cited in THEORY-OF-TRAITS.md (Adjacent literature — Duckworth section) as third-party confirmation that the trait-as-virtue framing under-delivers. Used in external positioning to show the differentiation is not just rhetorical — the empirical case for grit-as-leverage is contested in the literature.

Meta-analysis uses self-report grit scales (Grit-S, Grit-O), which have construct-validity criticisms of their own. Does not engage situational or Orientation variables — argues from within the trait paradigm rather than pointing at what's missing from it.