Grit Research Honestly Assessed: What Duckworth's Study Shows, What It Doesn't, and What Parents Should Take Away

When Grit: The Power of Passion and Perseverance was published in 2016, it became one of the fastest-selling parenting and education books in years. Schools ordered the Grit Scale by the classroom set. Coaches printed “Grit” posters. Parents began framing every setback as a grit-building opportunity. A TED talk that has now been viewed over 30 million times had seeded the idea that perseverance in the face of failure — more than talent, more than intelligence — was the secret variable in long-term achievement.

The research behind the book is real. And it is also substantially more complicated and more contested than the pop-science packaging suggested. Understanding what the evidence actually shows — and where it doesn’t hold up — matters for parents who want to raise persistent, motivated children and want to ground that goal in something more reliable than a bestseller’s thesis.

Key Takeaways

• Duckworth’s grit scale measures two components — consistency of interest (passion) and perseverance of effort — and both show modest positive correlations with outcomes like academic retention and performance.
• Multiple replications have found that grit’s predictive power largely overlaps with conscientiousness, a well-established Big Five personality trait, raising the question of whether grit adds meaningful new predictive information.
• Grit’s effects appear weaker in low-income and disadvantaged populations — where structural barriers, not individual perseverance, are primary determinants of outcomes — a finding Duckworth’s critics have emphasized as a key limitation.
• School-based grit interventions, including those tested by Duckworth’s own lab, have produced disappointing results: a 2016 randomized controlled trial found no significant improvement in academic outcomes from targeted grit programs.
• The most defensible parent takeaway is narrower than the popular version: sustained, deliberate practice in a domain children find genuinely interesting builds skill — but manufactured grit training doesn’t reliably transfer.

What Duckworth’s Research Actually Found

Angela Duckworth, a psychologist at the University of Pennsylvania, began publishing work on grit in 2007. The foundational paper, “Grit: Perseverance and Passion for Long-Term Goals” (Duckworth et al., 2007, Journal of Personality and Social Psychology), introduced the Grit Scale and reported findings across six studies.

The original studies found that grit predicted:

• Retention at West Point Military Academy better than the Whole Candidate Score (the composite of academic and physical measures used for admissions)
• Completion rate of the National Spelling Bee beyond IQ measures
• Higher GPAs in Ivy League undergraduates (while IQ predicted SAT scores better)
• Retention in two other adult samples

The interpretive leap in the popular version — that grit matters “more than talent” — is not quite what the research showed. The studies showed that grit added predictive variance beyond some measures. They did not show it outperforms cognitive ability across a broad range of outcomes. Duckworth has been careful in her academic writing to make more qualified claims; the popular version ran further than the data.

The Grit Scale itself consists of 12 items rated on a 5-point scale:

Item Type	Example	Component
Consistency of interest	”I often set a goal but later choose to pursue a different one” (reverse-scored)	Passion
Perseverance of effort	”Setbacks don’t discourage me. I don’t give up easily.”	Perseverance

Higher scores predict persistence in specific contexts — military training, competitive events, academic programs with high attrition. What the scale does not reliably predict: performance quality, creativity, leadership, or outcomes in people who are not voluntarily enrolled in high-stakes selection environments.

Where the Critiques Land

The academic response to the grit research has been substantially more skeptical than the popular response. Several distinct lines of critique have emerged.

The Conscientiousness Problem

The most sustained academic criticism comes from researchers pointing out that grit closely resembles conscientiousness — one of the Big Five personality traits that has been studied for decades, has strong reliability and validity data, and predicts life outcomes including academic achievement, occupational success, and health behaviors with well-established effect sizes.

Marcus Credé at Iowa State University conducted a meta-analysis published in the Journal of Personality and Social Psychology in 2017 analyzing 88 samples and more than 66,000 participants. The findings were pointed: grit’s correlation with academic performance was r = .18 — modest — and when conscientiousness was statistically controlled, the incremental predictive validity of grit dropped substantially. Credé’s conclusion was that grit appeared to largely be a repackaging of conscientiousness with a new name, without adding substantially to what was already predictable from existing personality measures.

Duckworth and colleagues responded to these criticisms, arguing that the two components of grit (consistency of interest and perseverance of effort) load differently onto conscientiousness facets — that perseverance overlaps with conscientiousness substantially but consistency of interest does not — and that this distinction has meaningful implications. The academic debate remains active.

The Equity Problem

A more pointed critique, voiced by researchers including Alfie Kohn and Angela Duckworth’s own collaborators, concerns the equity implications of grit-focused educational approaches. The argument: if grit is presented as the primary variable separating successful from unsuccessful people, this framing places the explanatory weight on individual character rather than structural conditions.

Researchers studying low-income students have documented what some have called “contextual grit” — the extraordinary persistence low-income students often demonstrate in navigating systems that create barriers rather than support. These students are not lacking grit. They are confronting structural conditions that conscientiousness and perseverance cannot overcome at the individual level. A grit-focused curriculum in a school with inadequate resources, inexperienced teachers, and environmental stressors is addressing the wrong variable.

Duckworth has acknowledged these concerns publicly and has noted that grit effects in her research are smaller in socioeconomically disadvantaged populations than in high-selection environments like West Point or spelling bees — environments where participants have already cleared multiple structural filters before the grit variable becomes differentially predictive.

The Intervention Problem

Perhaps the most practically significant critique for parents and educators is that attempts to directly teach grit have produced underwhelming results. In 2016, Duckworth’s own lab published a randomized controlled trial of a character-lab developed curriculum designed to build self-control and grit in middle school students. The results showed no significant improvement in academic outcomes compared to control groups.

This finding is consistent with a broader pattern in social-emotional learning research: self-report measures of perseverance-related traits correlate with outcomes, but targeted curricula designed to increase those measured traits do not reliably improve outcomes. The trait may be a marker, not a lever.

What the Research Actually Supports

Stripping away the critique and looking at what reliably survives across the literature:

Deliberate practice works. The work of K. Anders Ericsson on deliberate practice — the specific, effortful, feedback-rich practice that underlies expertise development — has stronger and more consistent empirical support than the grit framework. Deliberate practice involves practicing at the edge of current ability with feedback and correction, not just persisting. This is mechanistically more specific than grit, and the research is cleaner.

Intrinsic motivation predicts persistence better than grit. Research in self-determination theory (Deci and Ryan at University of Rochester) has consistently shown that intrinsic motivation — doing something because you find it inherently interesting or satisfying — produces more durable persistence than extrinsic motivation or willpower-based frameworks. Children who find a domain genuinely interesting persist in it through difficulty without requiring a grit framework. The implication: identifying and supporting genuine interests may matter more than building generic perseverance.

Growth mindset interacts with grit. Carol Dweck’s research on growth mindset — the belief that ability can be developed through effort — has separate evidence and works through a different mechanism than grit. A child with a growth mindset responds to failure differently from one with a fixed mindset, regardless of current grit scores. The mindset intervention has cleaner randomized trial support than grit-building curricula.

Consistency of interest predicts long-term outcomes differently by age. Longitudinal research suggests that passion — the consistency of interest component — shows relatively low stability in children and adolescents, particularly before mid-adolescence. This has an important implication: children who explore multiple interests and abandon some are not demonstrating a grit deficit. They are doing what developmental psychology suggests is appropriate for their stage.

What Parents Should Actually Do

The honest translation of the research evidence into parenting practice is more modest and more specific than the bestseller suggested.

Don’t manufacture difficulty to build grit. There is no evidence that exposing children to arbitrary challenge builds generalizable perseverance. What the research supports is difficulty in the context of genuine interest, with appropriate support and feedback.

Support sustained engagement in domains children actually find interesting. The pathway to the benefits associated with grit runs through genuine interest, not through willpower applied to things children don’t care about.

Deliberate practice in context. Help children understand that improvement in any skill — music, math, coding, athletics — requires practicing what they can’t yet do, not repeating what they can. This specific kind of challenging practice produces skill growth; generic encouragement to persist does not.

Distinguish quitting from choosing. Not every decision to stop an activity is a grit failure. Distinguishing “I’m quitting because this is hard” from “I’m stopping because I’ve genuinely discovered I don’t want to invest in this” is a sophisticated judgment call that requires knowing your child. Research does not support a blanket policy against quitting.

Model perseverance in your own pursuits. Parent modeling of sustained engagement with difficult goals has better evidence than any targeted grit curriculum.

What to Watch For Over 3 Months

If you’re applying these ideas to a specific child over the coming weeks:

• Is engagement with a chosen activity deepening? Genuine interest tends to deepen with skill, not remain flat. A child who is still enthusiastic about the same activity three months in, having worked through early difficulties, is showing the pattern the research describes.
• How does your child respond to hitting a skill plateau? This is the most diagnostic moment — whether they seek strategies for improvement, ask for feedback, and continue, or whether they disengage entirely.
• Are you supporting or pushing? The research distinguishes parental autonomy support (helping children pursue their own goals) from parental control (pushing children toward goals the parent has selected). Autonomy support predicts better persistence outcomes.
• Is the child developing an identity around the activity? Identity investment — “I’m a musician” rather than “I take piano” — predicts more durable engagement through difficulty.

Frequently Asked Questions

Is grit a real psychological trait or just a rebranded idea?

It’s a measurable trait with real predictive correlations, but critics have documented substantial overlap with conscientiousness, a well-established Big Five trait. The debate about whether grit adds meaningful predictive information beyond conscientiousness is ongoing among researchers. For practical parenting purposes, the underlying traits — sustained effort and consistency of interest — are real and worth cultivating, regardless of how we label them.

Should I make my kid finish activities they want to quit?

The research doesn’t support a blanket “always finish what you start” policy. Duckworth herself has noted that quitting activities that are a poor fit is not a grit failure. A useful heuristic: establish a commitment period at the start (finishing the season, the semester) that allows time to assess genuine disinterest versus difficulty-aversion, then honor the exit gracefully.

Do grit programs at school actually work?

The evidence here is disappointing. A 2016 randomized trial by Duckworth’s own lab found no significant academic improvement from targeted grit curriculum. Broader SEL research shows mixed results for character-focused curricula. School programs that improve outcomes tend to do so through academic support, supportive relationships, and reduced stress — not through character education alone.

Is it harmful to push my kid to persevere through things they hate?

Pushing persistence through genuine disinterest — as opposed to difficulty — is unlikely to build transferable grit and may undermine intrinsic motivation in the domain. Self-determination theory research suggests that external pressure on low-interest activities produces compliance in the short term but typically produces disengagement and reduced self-regulation over time.

How does grit relate to growth mindset?

They are distinct constructs with different evidence bases. Growth mindset (Dweck) is a belief about whether ability is fixed or malleable — it affects how children interpret failure. Grit is a trait describing sustained effort and interest. A child can have a growth mindset but low grit, or vice versa. The interventions that change growth mindset beliefs have stronger randomized trial support than grit-building programs.

---

Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.

Sources

1. Duckworth, A. L., et al. (2007). Grit: Perseverance and passion for long-term goals. Journal of Personality and Social Psychology, 92(6), 1087–1101. https://doi.org/10.1037/0022-3514.92.6.1087
2. Credé, M., Tynan, M. C., & Harms, P. D. (2017). Much ado about grit: A meta-analytic synthesis of the grit literature. Journal of Personality and Social Psychology, 113(3), 492–511. https://doi.org/10.1037/pspp0000102
3. Duckworth, A. L., & Yeager, D. S. (2015). Measurement matters: Assessing personal qualities other than cognitive ability for educational purposes. Educational Researcher, 44(4), 237–251. https://doi.org/10.3102/0013189X15584327
4. Ericsson, K. A., Krampe, R. T., & Tesch-Römer, C. (1993). The role of deliberate practice in the acquisition of expert performance. Psychological Review, 100(3), 363–406. https://doi.org/10.1037/0033-295X.100.3.363
5. Deci, E. L., & Ryan, R. M. (2000). The “what” and “why” of goal pursuits: Human needs and the self-determination of behavior. Psychological Inquiry, 11(4), 227–268. https://doi.org/10.1207/S15327965PLI1104_01
6. Yeager, D. S., et al. (2019). A national experiment reveals where a growth mindset improves achievement. Nature, 573, 364–369. https://doi.org/10.1038/s41586-019-1466-y