Conscientiousness: the personality trait that predicts the most

By the 64 Types team · Updated October 13, 2026 · 5 min read · 25 peer-reviewed sources

Conscientiousness is the tendency to be organised, responsible, hardworking, self-controlled and goal-directed.[1] Of the Big Five traits, it has one of the broadest records of predicting real-world outcomes: job performance across every occupational group studied,[2] grades independent of intelligence,[3] healthier behaviour[4] and a longer life.[5] Each individual effect is modest (the link with longevity is r = .11),[5] but the effects show up consistently across many areas of life. Conscientiousness also tends to rise through adulthood and can be built deliberately.[6][7]

In the familiar four-letter types, conscientiousness roughly corresponds to J (higher) versus P (lower).[8]

What conscientiousness is

Personality researchers describe conscientiousness as the propensity to control impulses, follow socially prescribed norms, plan, persist toward goals and delay gratification.[1] Detailed inventories divide it into six facets: self-efficacy, orderliness, dutifulness, achievement-striving, self-discipline and cautiousness.[9]

The six facets of conscientiousness in the IPIP-NEO-120 (Johnson, 2014)
FacetWhat a high score looks like
Self-efficacyConfident that you can get things done
OrderlinessLikes tidiness, schedules and systems
DutifulnessKeeps promises and follows the rules
Achievement-strivingSets high goals and works hard toward them
Self-disciplineStarts tasks promptly and finishes them despite boredom
CautiousnessThinks before acting; avoids rash decisions

Typical questionnaire items include “I am always prepared”, “I pay attention to details” and “I follow a schedule”, while low scorers agree with statements like “I leave my belongings around” and “I shirk my duties”.[10]

The MBTI’s J/P scale overlaps with conscientiousness only moderately, and its developers’ interpretation of J/P was questioned by McCrae and Costa.[8] So a J is probably above average on conscientiousness, but the letter is a rough proxy.

At work

In the classic meta-analysis of the Big Five and job performance, conscientiousness was the one trait with consistent relations to all performance criteria across all five occupational groups studied.[2]

A century-spanning synthesis of more than 2,500 studies found that conscientiousness relates in the desirable direction to 98% of occupational variables examined. The authors summarised its role in ten themes, including motivation for goal-directed performance, commitment, perseverance, a preference for predictable environments and restraint from counterproductive behaviour.[11]

Over a whole career, conscientiousness measured in childhood and adulthood predicted job satisfaction, income and occupational status, beyond general mental ability.[12] Entrepreneurs score higher on it than managers.[13] And together with Honesty-Humility and agreeableness, it is one of the main predictors of avoiding workplace deviance.[14]

One nuance: the same synthesis found that the performance advantage of conscientiousness is weaker in highly complex jobs than in jobs of low to moderate complexity.[11]

At school and university

A meta-analysis of personality and academic performance, with cumulative samples of more than 70,000, found that conscientiousness correlated with grades largely independently of intelligence. At university level, once earlier school performance was taken into account, conscientiousness added as much to the prediction of grades as intelligence did.[3]

Health and longevity

A meta-analysis of 194 studies found that conscientiousness-related traits were negatively related to every risky health behaviour examined (tobacco, excessive alcohol, drug use, unhealthy eating and inactivity, risky driving, risky sex, suicide and violence) and positively related to every beneficial one.[4]

Over the long term this adds up. Across 20 independent samples, higher conscientiousness was associated with longer life (r = .11, 95% CI .05 to .17), with the strongest links for the achievement and order facets.[5] In a long-term study, childhood conscientiousness predicted adult health partly through educational attainment and healthier behaviour.[15]

Mental health shows the same pattern from the other side: across anxiety, depressive and substance-use disorders, diagnosed groups scored substantially lower on conscientiousness (mean d = −1.01).[16]

Self-control in childhood

Self-control is a core part of conscientiousness. In a cohort of 1,000 children followed from birth to age 32, childhood self-control predicted physical health, substance dependence, personal finances and criminal offending, following a gradient across the whole range of self-control. The effects were separable from intelligence and social class, and in a second cohort of 500 sibling pairs, the sibling with lower self-control had poorer outcomes despite the shared family background.[17]

In relationships

A partner’s conscientiousness is one of the traits linked to the other person’s relationship satisfaction,[18][19] and across 10 world regions, lower conscientiousness (along with lower agreeableness) was associated with relationship infidelity.[20] More in personality and relationships.

Keeping it in perspective

Three caveats keep these findings honest:

  • Effects are modest for individuals. Correlations such as .11 with longevity are meaningful across a population but leave plenty of room for individual exceptions.[5][21]
  • Published effects shrink somewhat on replication, to about 77% of their original size on average across trait–outcome links.[22]
  • Lower conscientiousness is not a character flaw. Low scorers are typically more spontaneous and flexible, and many thrive by building external structure into their lives.

Creativity: an interesting exception

In a meta-analysis of personality and creative achievement, which compared scientists and artists with less creative groups, creative people in general tended to be more open to experience, less conventional and less conscientious than comparison groups.[23] Conscientiousness helps you finish things; openness and some tolerance for disorder may help you start unusual ones. People who are high on both can carry original ideas through to completion, which is why a high-openness, low-conscientiousness profile such as ENFP often benefits from a partner, deadline or system that supplies the follow-through.

Your J/P letter in context

In the norm sample behind 64 Types, the average conscientiousness score is 3.35 on a 1–5 scale, so the J/P cut-off sits there, not at the scale midpoint of 3. Because scores pile up near the middle,[24] a meaningful share of people land within 10 percentile points of the cut-off and receive a borderline flag on this letter. See How the 64 Types test works.

Can you become more conscientious?

Yes. On average, conscientiousness increases across adulthood, especially in young adulthood (roughly 20 to 40).[6] Deliberate change is possible too: in randomised experiments, people who set goals to become more conscientious showed increases over 16 weeks, especially when they formed specific if–then plans,[7] and a three-month coaching app produced changes that friends and family noticed.[25]

Practical tip: if–then plans

Write implementation intentions for the behaviours you want: “If it is 8:30 on a weekday, then I write my top three tasks before opening email.” This was the technique that helped in the randomised trial.[7]

Practical tip: change the environment

Rely less on willpower and more on design: put tasks in a calendar, use checklists, set up automatic savings, and keep distractions out of reach.

Practical tip: by profile

If you score as P (Flexible), pair up with an organised colleague or friend for shared deadlines. If you score as J (Organized) and also R (Responsive), set an explicit “good enough” standard before you start, so high standards do not tip into worry.

See profiles that combine high conscientiousness with other traits, such as ISTJ and ENTJ, or lower conscientiousness, such as ENFP and ISTP.

Frequently asked questions

Why is conscientiousness so important?

It predicts a wide range of outcomes: job performance across occupations,[2] academic performance beyond intelligence,[3] health behaviours[4] and longevity.[5]

Is conscientiousness the same as J in MBTI?

Roughly. The J/P scale correlates moderately with conscientiousness, so J usually means above-average conscientiousness, but the overlap is not complete.[8]

Does conscientiousness increase with age?

Yes. It rises on average across adulthood, especially between about 20 and 40.[6]

Is conscientiousness more important than intelligence?

They are largely independent, and both matter. At university, conscientiousness added as much to predicting grades as intelligence did once earlier school performance was controlled.[3] For income, both conscientiousness and mental ability contributed.[12]

References

  1. Roberts, B. W., Lejuez, C., Krueger, R. F., Richards, J. M., & Hill, P. L. (2014). What is conscientiousness and how can it be assessed? Developmental Psychology, 50(5), 1315–1330.
  2. Barrick, M. R., & Mount, M. K. (1991). The Big Five personality dimensions and job performance: A meta-analysis. Personnel Psychology, 44(1), 1–26.
  3. Poropat, A. E. (2009). A meta-analysis of the five-factor model of personality and academic performance. Psychological Bulletin, 135(2), 322–338.
  4. Bogg, T., & Roberts, B. W. (2004). Conscientiousness and health-related behaviors: A meta-analysis of the leading behavioral contributors to mortality. Psychological Bulletin, 130(6), 887–919.
  5. Kern, M. L., & Friedman, H. S. (2008). Do conscientious individuals live longer? A quantitative review. Health Psychology, 27(5), 505–512.
  6. Roberts, B. W., Walton, K. E., & Viechtbauer, W. (2006). Patterns of mean-level change in personality traits across the life course: A meta-analysis of longitudinal studies. Psychological Bulletin, 132(1), 1–25.
  7. Hudson, N. W., & Fraley, R. C. (2015). Volitional personality trait change: Can people choose to change their personality traits? Journal of Personality and Social Psychology, 109(3), 490–507.
  8. McCrae, R. R., & Costa, P. T. (1989). Reinterpreting the Myers-Briggs Type Indicator from the perspective of the five-factor model of personality. Journal of Personality, 57(1), 17–40.
  9. Johnson, J. A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. Journal of Research in Personality, 51, 78–89.
  10. Goldberg, L. R. (1992). The development of markers for the Big-Five factor structure. Psychological Assessment, 4(1), 26–42.
  11. Wilmot, M. P., & Ones, D. S. (2019). A century of research on conscientiousness at work. Proceedings of the National Academy of Sciences, 116(46), 23004–23010.
  12. Judge, T. A., Higgins, C. A., Thoresen, C. J., & Barrick, M. R. (1999). The Big Five personality traits, general mental ability, and career success across the life span. Personnel Psychology, 52(3), 621–652.
  13. Zhao, H., & Seibert, S. E. (2006). The Big Five personality dimensions and entrepreneurial status: A meta-analytical review. Journal of Applied Psychology, 91(2), 259–271.
  14. Pletzer, J. L., Bentvelzen, M., Oostrom, J. K., & de Vries, R. E. (2019). A meta-analysis of the relations between personality and workplace deviance: Big Five versus HEXACO. Journal of Vocational Behavior, 112, 369–383.
  15. Hampson, S. E., Goldberg, L. R., Vogt, T. M., & Dubanoski, J. P. (2007). Mechanisms by which childhood personality traits influence adult health status: Educational attainment and healthy behaviors. Health Psychology, 26(1), 121–125.
  16. Kotov, R., Gamez, W., Schmidt, F., & Watson, D. (2010). Linking "big" personality traits to anxiety, depressive, and substance use disorders: A meta-analysis. Psychological Bulletin, 136(5), 768–821.
  17. Moffitt, T. E., Arseneault, L., Belsky, D., Dickson, N., Hancox, R. J., Harrington, H., et al. (2011). A gradient of childhood self-control predicts health, wealth, and public safety. Proceedings of the National Academy of Sciences, 108(7), 2693–2698.
  18. Malouff, J. M., Thorsteinsson, E. B., Schutte, N. S., Bhullar, N., & Rooke, S. E. (2010). The five-factor model of personality and relationship satisfaction of intimate partners: A meta-analysis. Journal of Research in Personality, 44(1), 124–127.
  19. Dyrenforth, P. S., Kashy, D. A., Donnellan, M. B., & Lucas, R. E. (2010). Predicting relationship and life satisfaction from personality in nationally representative samples from three countries: The relative importance of actor, partner, and similarity effects. Journal of Personality and Social Psychology, 99(4), 690–702.
  20. Schmitt, D. P. (2004). The Big Five related to risky sexual behaviour across 10 world regions: Differential personality associations of sexual promiscuity and relationship infidelity. European Journal of Personality, 18(4), 301–319.
  21. Ozer, D. J., & Benet-Martínez, V. (2006). Personality and the prediction of consequential outcomes. Annual Review of Psychology, 57, 401–421.
  22. Soto, C. J. (2019). How replicable are links between personality traits and consequential life outcomes? The Life Outcomes of Personality Replication Project. Psychological Science, 30(5), 711–727.
  23. Feist, G. J. (1998). A meta-analysis of personality in scientific and artistic creativity. Personality and Social Psychology Review, 2(4), 290–309.
  24. Bess, T. L., & Harvey, R. J. (2002). Bimodal score distributions and the Myers-Briggs Type Indicator: Fact or artifact? Journal of Personality Assessment, 78(1), 176–186.
  25. Stieger, M., Flückiger, C., Rüegger, D., Kowatsch, T., Roberts, B. W., & Allemand, M. (2021). Changing personality traits with the help of a digital personality change intervention. Proceedings of the National Academy of Sciences, 118(8), e2017548118.

How we write guides: every research claim cites a peer-reviewed source, effect sizes are reported as published, and advice that goes beyond the evidence is labelled as a practical tip. See our methodology. Found an error? Email [email protected].

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