Angela Duckworth and the Modern Science of Grit

Last Updated May 26, 2026

Angela Duckworth’s work on grit changed the public language of achievement. By defining grit as sustained passion and perseverance for long-term goals, Duckworth helped shift attention away from talent alone and toward the slower psychological processes that allow people to remain committed to difficult work over time. Her research became influential in psychology, education, leadership, parenting, sports, organizational life, and public conversation because it named something many people already sensed: excellence is rarely built by intensity alone. It usually requires durable effort, delayed gratification, revision, boredom tolerance, and commitment through setbacks.

Yet the modern science of grit is more complex than the popular version of grit. Duckworth’s contribution was not simply motivational. It was empirical: she and her collaborators attempted to define, measure, and test grit as a psychological construct. The research tradition that followed has expanded, refined, challenged, and sometimes corrected the early claims. A serious account of Duckworth’s legacy must therefore hold two truths together. First, grit remains a powerful and useful idea for understanding long-term effort. Second, grit should not be treated as a magic explanation for success, a moral label for individuals, or a substitute for opportunity, instruction, health, institutional support, or structural justice.

Overview

Angela Duckworth is one of the central figures in the modern study of grit. Her research helped popularize the idea that long-term achievement depends not only on talent, intelligence, or short-term motivation, but also on the capacity to sustain effort and interest across extended periods of difficulty. In public culture, this idea is often simplified into a message of persistence. In the scientific literature, however, grit is more precise and more contested.

Duckworth’s modern grit framework emerged from a broader psychological concern: why do some people continue developing skill and pursuing long-term aims after others stop? The question is not new. Philosophers, educators, coaches, religious traditions, artists, and working communities have long recognized the importance of perseverance. Duckworth’s contribution was to translate that concern into a measurable psychological construct and to study whether it predicted outcomes beyond established traits.

The result was a research program that made grit visible. It produced measures, empirical studies, developmental theories, educational interventions, popular writing, and public debate. It also provoked criticism. Researchers asked whether grit was truly distinct from conscientiousness, whether its predictive effects were overstated, whether the two-factor structure was stable, and whether grit language could be misused to blame individuals for unequal conditions.

The modern science of grit is therefore not a simple celebration of persistence. It is an evolving field that asks how people sustain meaningful effort, how that effort can be measured, how it relates to personality and motivation, and how institutions can support persistence without turning grit into a moral burden.

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Duckworth’s contribution to psychology

Duckworth’s work belongs to a broader movement in psychology that studies non-cognitive, social-emotional, motivational, and personality-related contributors to human development. The phrase “non-cognitive” can be misleading because traits such as grit involve cognition, emotion, judgment, identity, and self-regulation. Still, the term points to an important research concern: standardized intelligence and academic ability do not fully explain why people persist, improve, and achieve over time.

Duckworth’s research on grit drew attention to the long arc of achievement. Many important goals do not reward people immediately. They require practice, feedback, failure, revision, repetition, and long periods in which progress is uneven. The grit construct made this temporal dimension central. It asked whether some people are more likely to maintain commitment and effort after novelty fades.

That emphasis helped correct a cultural obsession with talent. Talent matters. Intelligence, ability, early exposure, and domain-specific aptitude matter. But talent does not automatically become accomplishment. A person can be talented and inconsistent. A person can begin with modest ability and improve through sustained effort, high-quality practice, mentorship, and commitment. Duckworth’s framework helped bring this distinction into public view.

Her contribution was also institutional. Through research, public writing, education-facing work, and organizations focused on character development, Duckworth helped move grit from a narrow academic construct into a larger conversation about how schools, families, teams, and organizations understand human potential. That public influence is part of why the concept requires careful handling. Ideas that enter policy and practice can do good, but they can also become distorted when simplified into slogans.

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The modern definition of grit

In Duckworth’s original formulation, grit is “perseverance and passion for long-term goals.” Each part of that definition matters. Perseverance refers to sustained effort despite difficulty, delay, failure, boredom, or discouragement. Passion does not mean constant excitement. In this framework, passion means enduring commitment to a higher-order aim that remains meaningful over time.

This is why grit differs from short bursts of intensity. A person can be highly motivated for a week and then abandon the goal. Another person may work quietly, steadily, and imperfectly for years. The second pattern is closer to grit. Grit is less about emotional excitement and more about durable direction.

The phrase “long-term goals” is also essential. Grit is not simply finishing a task. It refers to sustained investment in an aim that requires development: mastering an instrument, becoming a scientist, completing a demanding course of study, building a craft, developing an ethical organization, recovering after repeated setbacks, or contributing to a long public project. Grit concerns the psychology of continuation.

Modern interpretations of grit should also include discernment. Persistence is not automatically wise. Goals can become harmful, obsolete, exploitative, or misaligned with a person’s values. The strongest version of grit is adaptive persistence: sustained commitment joined to learning, feedback, rest, revision, and moral judgment.

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The two-factor model: effort and interest

Duckworth’s grit framework is often discussed as a single trait, but the measurement tradition usually divides grit into two related dimensions: perseverance of effort and consistency of interest. This distinction is important because later research has found that the two dimensions do not always behave identically.

Perseverance of effort

Perseverance of effort refers to continued work despite difficulty. It is the most intuitive part of grit and often the most empirically useful. It includes stamina, follow-through, willingness to practice, recovery after setbacks, and continued investment when results are delayed.

In practice, perseverance of effort is often what people mean when they praise someone as gritty. The person keeps showing up. They revise the paper, return to the lab, continue training, rebuild the project, reapply after rejection, or continue learning after embarrassment. This facet of grit has strong connections to effort regulation, industriousness, and disciplined practice.

Consistency of interest

Consistency of interest refers to the tendency to maintain a stable long-term direction rather than frequently abandoning goals. This facet is more complicated. Deep achievement often requires sustained attention within a domain, but human development also requires exploration. People grow by trying, revising, leaving, and beginning again.

A mature interpretation of consistency does not require rigid sameness. It does not mean never changing fields, careers, research questions, or creative forms. It means that enduring accomplishment often requires enough continuity for skills, judgment, relationships, and identity to accumulate. The challenge is to distinguish adaptive exploration from chronic abandonment, and wise revision from restless avoidance.

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Measuring grit: from Grit-O to Grit-S

Duckworth’s scientific contribution depended heavily on measurement. Without a measure, grit would remain a broad moral or motivational term. The original Grit Scale, sometimes called Grit-O, was designed to assess individual differences in perseverance and passion for long-term goals. The later Short Grit Scale, or Grit-S, reduced the instrument to a shorter set of items intended to preserve the core structure more efficiently.

These scales made grit research possible, but they also created challenges. Most grit measures are self-report instruments. Self-report can be useful, but it is not neutral. People vary in how accurately they understand themselves, how honestly they respond, how they interpret scale language, and what comparison group they use. Cultural expectations, school climate, family norms, and social desirability can all affect responses.

Measurement is especially risky when the construct becomes popular. A scale designed for research can be misused in schools, workplaces, admissions, hiring, or performance management. Duckworth and Yeager’s later work on measuring personal qualities emphasized caution: measures of character, motivation, and social-emotional qualities are often not appropriate for high-stakes individual evaluation. This is a crucial corrective to simplistic applications of grit.

Good measurement asks not only whether a scale produces a number, but what that number means, how stable it is, whether it predicts outcomes, whether it overlaps with existing traits, whether it behaves similarly across groups, and whether it can be used ethically in real institutions.

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Grit and achievement

Duckworth’s early studies examined grit in relation to achievement across several demanding contexts, including education, military training, spelling competitions, and other settings where long-term effort matters. The central claim was not that grit is the only predictor of achievement, but that sustained perseverance and long-term commitment can help explain why some people continue when others stop.

This claim resonated because it challenged the myth that success is mostly the result of innate brilliance. Grit helped explain why effort matters after talent has opened the door. A student with high aptitude may fail to complete a demanding course if they do not study consistently. A talented athlete may plateau without sustained practice. A promising writer may stop improving if they cannot tolerate revision. Achievement often requires repeated contact with frustration.

At the same time, the relationship between grit and achievement should be interpreted modestly. Later research suggests that grit is associated with achievement and retention, but the magnitude of the relationship is often smaller than popular accounts imply. Grit may matter, but it is one predictor among many. Prior knowledge, instruction, socioeconomic conditions, health, discrimination, institutional design, mentorship, and chance all shape outcomes.

The most useful interpretation is not “grit causes success.” A better formulation is: grit may support sustained engagement in long-term goal pursuit, especially when combined with opportunity, strategy, feedback, and support.

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Grit, self-control, and conscientiousness

Duckworth’s work is closely connected to self-control and conscientiousness. Understanding these relationships is essential because many criticisms of grit focus on whether it adds anything new beyond existing constructs.

Grit and self-control

Self-control concerns the regulation of immediate impulses, temptations, emotions, and distractions. It helps people choose a future benefit over a present impulse. A student uses self-control when they continue studying instead of checking their phone. A worker uses self-control when they manage frustration during a difficult conversation. A musician uses self-control when they complete focused practice instead of stopping at the first sign of boredom.

Grit operates over a longer time horizon. It concerns whether effort and interest remain organized around a long-term goal across months or years. Self-control may help someone stay focused today. Grit helps explain whether they keep returning to the larger aim across many days.

Grit and conscientiousness

Conscientiousness is one of the Big Five personality traits. It includes responsibility, orderliness, industriousness, dependability, and goal-directed behavior. Grit overlaps substantially with conscientiousness, especially with industriousness and perseverance. This overlap does not make grit useless, but it does mean grit should not be presented as if it were wholly separate from earlier personality research.

A balanced view sees grit as a narrower, long-term-goal-oriented expression within a larger family of traits and capacities. It emphasizes sustained effort and interest, but it must be studied alongside conscientiousness, self-control, motivation, identity, purpose, and context.

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Grit in education

Grit became especially influential in education because schools are places where long-term effort, delayed rewards, frustration, and revision are central. Students must learn difficult material before they can fully understand why it matters. They must continue after poor grades, confusion, comparison, boredom, and uneven development. Grit offered educators a language for academic persistence.

However, education is also where grit can be most easily misused. It is dangerous to tell students to be gritty while ignoring inadequate school funding, overcrowded classrooms, unsafe neighborhoods, hunger, unstable housing, racism, disability barriers, trauma, or unequal access to advanced coursework. A student’s persistence is shaped by the environment in which persistence is demanded.

A responsible educational use of grit does not begin with blaming students. It begins with designing learning environments where sustained effort is possible. Students need clear goals, supportive challenge, timely feedback, revision opportunities, belonging, autonomy, culturally responsive teaching, and adults who interpret mistakes as part of learning rather than as evidence of fixed ability.

In this sense, the best educational application of Duckworth’s work is not a poster that says “Never give up.” It is an institutional design question: what kinds of classrooms, relationships, assignments, assessments, and supports help students remain engaged in meaningful work over time?

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Criticism, replication, and refinement

The scientific importance of grit is partly shown by the criticism it received. A construct that becomes influential must survive scrutiny. Researchers have questioned the structure, distinctiveness, predictive power, and practical use of grit. These critiques should not be treated as attacks on persistence. They are part of the normal work of science.

Overlap with conscientiousness

One major criticism is that grit overlaps strongly with conscientiousness. If grit is largely a repackaging of industriousness, persistence, and goal-directedness, then the construct may be less novel than early public discussion suggested. This does not mean the idea is useless. It means claims about grit must be precise: what does grit add beyond existing personality measures?

Modest predictive effects

Meta-analytic work has suggested that grit is related to achievement and retention, but often modestly. In some analyses, perseverance of effort appears more useful than consistency of interest. This matters because popular grit narratives sometimes implied a stronger and broader predictive role than the evidence supports.

Factor structure concerns

Researchers have also debated whether grit should be treated as a higher-order trait made of two facets or whether the facets should be analyzed separately. If perseverance of effort and consistency of interest have different relationships with outcomes, combining them into one score can hide important differences.

Measurement cautions

Duckworth herself, especially in collaboration with Yeager, emphasized that measures of personal qualities should be used carefully. A self-report scale can be valuable for research, but it may be inappropriate for high-stakes individual evaluation. This point is central to the mature science of grit.

The value of critique

The critique of grit does not destroy the concept. It improves it. The best version of grit research is more modest, more contextual, more psychometrically careful, and more ethically aware than the popular slogan. Duckworth’s legacy should include both the original insight and the later corrections.

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Grit and structural context

The most serious modern account of grit must include structural context. Persistence is not produced by willpower alone. People persist within families, schools, workplaces, communities, economies, histories, and institutions. These environments can either support or damage long-term effort.

People with stable housing, safe schools, health care, time, mentoring, financial support, and social trust are often better positioned to sustain long-term goals. People facing poverty, discrimination, violence, precarious work, caregiving overload, illness, or institutional exclusion may need extraordinary persistence just to survive. In such contexts, low achievement cannot be interpreted as low grit.

This distinction is morally important. Grit can become a language of dignity when it recognizes the human capacity to endure, continue, rebuild, and pursue meaning. But it can become a language of blame when institutions use it to avoid responsibility. Telling individuals to become grittier is inadequate if the systems around them are unstable, unjust, or exploitative.

A structural account does not deny agency. It protects agency from distortion. People can cultivate habits, purpose, self-regulation, and perseverance. Institutions can also cultivate conditions that make sustained effort possible. The relationship is reciprocal: human beings persist better when the world around them is not organized to exhaust them.

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A mathematical lens on grit research

A mathematical lens can clarify the structure of grit research without reducing the human concept to a formula. The first model represents grit as a weighted combination of its two major facets:

This model makes a key research issue visible. If perseverance of effort predicts outcomes more strongly than consistency of interest, then the weights may not be equal. Treating grit as a single score may hide the fact that its components operate differently.

A second model represents achievement as an outcome influenced by grit and other variables:

This model shows why responsible grit research requires controls. If grit is studied alone, it may appear to explain more than it actually does. When prior achievement, conscientiousness, support, and context are included, the estimated grit effect may become smaller. That does not make grit irrelevant. It means grit belongs inside a larger explanatory system.

A third model can represent persistence dynamically over time:

This dynamic model is especially important because it resists the idea that grit is simply stored inside the individual. Effort is renewed, weakened, redirected, or depleted by feedback, meaning, support, fatigue, and circumstance. Grit is partly a trait, partly a practice, and partly an interaction between person and world.

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Responsible uses of Duckworth’s grit framework

Duckworth’s grit framework is most useful when it becomes a tool for reflection, research, and humane development. It is least useful when it becomes a slogan, sorting mechanism, or moral judgment.

For individuals, grit can help clarify the difference between short-term enthusiasm and long-term commitment. It can encourage people to ask what goals deserve sustained effort, what habits support continuation, what kinds of feedback improve practice, and when a goal should be revised rather than abandoned or pursued blindly.

For educators, grit can support classroom designs that normalize revision, challenge, feedback, and growth. But it should not become a way to blame students for systemic barriers. A gritty classroom is not one that demands suffering. It is one that helps students learn how to persist intelligently.

For organizations, grit can illuminate why long-term projects require more than talent. Teams need follow-through, resilience, and commitment. But organizations should not use grit rhetoric to justify burnout, underpayment, chronic overwork, or poor management. Institutional grit should include ethical leadership, fair expectations, rest, and the willingness to repair broken systems.

For researchers, grit remains a useful construct when handled precisely. The best research distinguishes facets, tests incremental validity, uses longitudinal designs where possible, avoids overclaiming, and treats social context as part of the explanatory system.

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Python workflow: modeling grit, achievement, and controls

The following Python workflow uses synthetic data to illustrate a central issue in grit research: grit may predict an outcome when studied alone, but its coefficient may change when prior achievement, conscientiousness, and social support are added to the model. This does not disprove grit. It demonstrates why construct overlap and context matter.

# Python workflow: Angela Duckworth and the modern science of grit
# Synthetic data for educational and research-method demonstration only.
# Do not use this workflow to evaluate, rank, hire, discipline, or assess real people.

import numpy as np
import pandas as pd
import statsmodels.api as sm

rng = np.random.default_rng(42)
n = 750

# Synthetic grit facets
perseverance_effort = rng.normal(0, 1, n)
consistency_interest = rng.normal(0, 1, n)

# Related constructs and context
conscientiousness = 0.60 * perseverance_effort + rng.normal(0, 0.80, n)
self_control = 0.45 * perseverance_effort + rng.normal(0, 0.90, n)
social_support = rng.normal(0, 1, n)
prior_achievement = rng.normal(0, 1, n)

# Combined grit index
grit_score = 0.60 * perseverance_effort + 0.40 * consistency_interest

# Synthetic achievement-related outcome
achievement_outcome = (
    0.18 * grit_score
    + 0.34 * prior_achievement
    + 0.22 * conscientiousness
    + 0.15 * self_control
    + 0.25 * social_support
    + rng.normal(0, 1, n)
)

df = pd.DataFrame({
    "perseverance_effort": perseverance_effort,
    "consistency_interest": consistency_interest,
    "grit_score": grit_score,
    "conscientiousness": conscientiousness,
    "self_control": self_control,
    "social_support": social_support,
    "prior_achievement": prior_achievement,
    "achievement_outcome": achievement_outcome
})

print("Correlation matrix")
print(df.corr().round(3))

# Model 1: grit alone
model_grit_only = sm.OLS(
    df["achievement_outcome"],
    sm.add_constant(df[["grit_score"]])
).fit()

# Model 2: grit plus psychological and contextual controls
model_contextual = sm.OLS(
    df["achievement_outcome"],
    sm.add_constant(df[[
        "grit_score",
        "prior_achievement",
        "conscientiousness",
        "self_control",
        "social_support"
    ]])
).fit()

comparison = pd.DataFrame({
    "model": ["grit_only", "grit_plus_controls"],
    "r_squared": [model_grit_only.rsquared, model_contextual.rsquared],
    "adjusted_r_squared": [model_grit_only.rsquared_adj, model_contextual.rsquared_adj],
    "grit_coefficient": [
        model_grit_only.params["grit_score"],
        model_contextual.params["grit_score"]
    ],
    "grit_p_value": [
        model_grit_only.pvalues["grit_score"],
        model_contextual.pvalues["grit_score"]
    ]
})

print("\nModel comparison")
print(comparison.round(4))

print("\nInterpretation:")
print(
    "If the grit coefficient declines after adding prior achievement, "
    "conscientiousness, self-control, and social support, the result should "
    "be interpreted as evidence that grit belongs inside a broader system of "
    "personality, motivation, opportunity, and context."
)

This workflow reflects the mature science of grit. The key question is not whether grit matters in isolation. The better question is how grit operates alongside personality, motivation, prior learning, support, and institutional conditions.

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R workflow: comparing grit-only and contextual models

The following R workflow mirrors the same conceptual structure. It simulates grit facets, creates a combined grit score, models an achievement-related outcome, and compares a grit-only regression with a broader contextual model.

# R workflow: Angela Duckworth and the modern science of grit
# Synthetic data for educational and research-method demonstration only.
# Do not use this workflow to evaluate, rank, hire, discipline, or assess real people.

set.seed(42)

n <- 750

# Synthetic grit facets
perseverance_effort <- rnorm(n)
consistency_interest <- rnorm(n)

# Related constructs and context
conscientiousness <- 0.60 * perseverance_effort + rnorm(n, sd = 0.80)
self_control <- 0.45 * perseverance_effort + rnorm(n, sd = 0.90)
social_support <- rnorm(n)
prior_achievement <- rnorm(n)

# Combined grit index
grit_score <- 0.60 * perseverance_effort + 0.40 * consistency_interest

# Synthetic achievement-related outcome
achievement_outcome <- (
  0.18 * grit_score +
  0.34 * prior_achievement +
  0.22 * conscientiousness +
  0.15 * self_control +
  0.25 * social_support +
  rnorm(n)
)

df <- data.frame(
  perseverance_effort,
  consistency_interest,
  grit_score,
  conscientiousness,
  self_control,
  social_support,
  prior_achievement,
  achievement_outcome
)

# Correlations
round(cor(df), 3)

# Model 1: grit alone
model_grit_only <- lm(achievement_outcome ~ grit_score, data = df)

# Model 2: grit plus controls
model_contextual <- lm(
  achievement_outcome ~ grit_score + prior_achievement +
    conscientiousness + self_control + social_support,
  data = df
)

comparison <- data.frame(
  model = c("grit_only", "grit_plus_controls"),
  r_squared = c(summary(model_grit_only)$r.squared, summary(model_contextual)$r.squared),
  adjusted_r_squared = c(summary(model_grit_only)$adj.r.squared, summary(model_contextual)$adj.r.squared),
  grit_coefficient = c(coef(model_grit_only)["grit_score"], coef(model_contextual)["grit_score"])
)

print(round(comparison, 4))

cat("
Interpretation:
A reduced grit coefficient in the contextual model does not mean grit is irrelevant.
It means that grit should be interpreted alongside prior achievement,
conscientiousness, self-control, social support, and opportunity.
")

The comparison between models is the central lesson. A responsible grit analysis does not isolate effort from context. It asks what grit contributes after accounting for other psychological and social variables.

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GitHub Repository

The companion GitHub repository provides a reproducible research-code structure for the Grit knowledge series, including article-specific workflows, synthetic data examples, documentation, and multi-language modeling assets.

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Conclusion

Angela Duckworth’s work on grit gave modern psychology and public culture a durable language for long-term effort. Her central insight remains valuable: talent alone does not explain achievement. Many meaningful accomplishments require sustained commitment, repeated practice, recovery from setbacks, and continued effort after excitement fades.

But the modern science of grit is not the same as the popular slogan. The research tradition now requires more precision. Grit overlaps with conscientiousness. Its effects are often modest. Perseverance of effort may be more useful than consistency of interest in some settings. Self-report measurement must be handled carefully. Structural context matters. Persistence can become harmful when it turns into overpersistence, burnout, or loyalty to goals and institutions that should be questioned.

Duckworth’s legacy is strongest when interpreted through this mature lens. Grit is not a replacement for talent, justice, teaching, health, opportunity, or institutional responsibility. It is a serious psychological construct that helps explain how people sustain meaningful effort over time. Used well, it encourages adaptive persistence, reflective goal commitment, and humane development. Used poorly, it becomes a moral burden placed on individuals while systems escape scrutiny.

The best version of grit is therefore neither sentimental nor punitive. It is disciplined, contextual, and ethical. It asks what is worth pursuing, what kind of effort produces growth, what support makes persistence possible, and when wisdom requires changing course.

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Related articles

• What Is Grit?
• Grit and Self-Control: Related but Not the Same
• Grit and Conscientiousness: Overlap, Distinction, and Debate
• The Grit Scale: Measuring Perseverance and Passion for Long-Term Goals
• Grit and Deliberate Practice
• Grit, Motivation, and Goal Hierarchies
• Grit and Academic Persistence
• Grit, Burnout, and the Risks of Overpersistence

Further reading

• Duckworth, A.L. (2016) Grit: The Power of Passion and Perseverance. New York: Scribner.
• Dweck, C.S. (2006) Mindset: The New Psychology of Success. New York: Random House.
• Mischel, W. (2014) The Marshmallow Test: Mastering Self-Control. New York: Little, Brown and Company.
• National Research Council (2012) Education for Life and Work: Developing Transferable Knowledge and Skills in the 21st Century. Washington, DC: The National Academies Press. Available at: https://www.nationalacademies.org/publications/13398/education-for-life-and-work-developing-transferable-knowledge-and-skills-in-the-21st-century
• University of Chicago Consortium on School Research (2015) Foundations for Young Adult Success: A Developmental Framework. Available at: https://consortium.uchicago.edu/publications/foundations-young-adult-success-developmental-framework
• Character Lab (n.d.) Research and resources on character development. Available at: https://characterlab.org/

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References

• Credé, M., Tynan, M.C. and Harms, P.D. (2017) ‘Much ado about grit: A meta-analytic synthesis of the grit literature’, Journal of Personality and Social Psychology, 113(3), pp. 492–511. Available at: https://doi.org/10.1037/pspp0000102
• Duckworth, A.L. (n.d.) Research. Available at: https://angeladuckworth.com/research/
• Duckworth, A.L. (n.d.) About Angela. Available at: https://angeladuckworth.com/about-angela/
• Duckworth, A.L., Peterson, C., Matthews, M.D. and Kelly, D.R. (2007) ‘Grit: Perseverance and passion for long-term goals’, Journal of Personality and Social Psychology, 92(6), pp. 1087–1101. Available at: https://doi.org/10.1037/0022-3514.92.6.1087
• Duckworth, A.L. and Quinn, P.D. (2009) ‘Development and validation of the Short Grit Scale (Grit–S)’, Journal of Personality Assessment, 91(2), pp. 166–174. Available at: https://doi.org/10.1080/00223890802634290
• Duckworth, A.L. and Seligman, M.E.P. (2005) ‘Self-discipline outdoes IQ in predicting academic performance of adolescents’, Psychological Science, 16(12), pp. 939–944. Available at: https://doi.org/10.1111/j.1467-9280.2005.01641.x
• Duckworth, A.L. and Yeager, D.S. (2015) ‘Measurement matters: Assessing personal qualities other than cognitive ability for educational purposes’, Educational Researcher, 44(4), pp. 237–251. Available at: https://doi.org/10.3102/0013189X15584327
• Mischel, W., Shoda, Y. and Rodriguez, M.L. (1989) ‘Delay of gratification in children’, Science, 244(4907), pp. 933–938. Available at: https://doi.org/10.1126/science.2658056
• National Research Council (2012) Education for Life and Work: Developing Transferable Knowledge and Skills in the 21st Century. Washington, DC: The National Academies Press. Available at: https://www.nationalacademies.org/publications/13398/education-for-life-and-work-developing-transferable-knowledge-and-skills-in-the-21st-century
• University of Pennsylvania Positive Psychology Center (n.d.) Angela Duckworth. Available at: https://ppc.sas.upenn.edu/people/angela-duckworth

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