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Big Five Personality Traits

A five-factor description of personality — openness, conscientiousness, extraversion, agreeableness and neuroticism — derived from the structure of trait language and replicated across many samples and instruments.

Definition

The five domains, with the direction that carries the label:

Openness to experience: imagination, aesthetic sensitivity, intellectual curiosity.
Conscientiousness: organisation, dependability, self-discipline.
Extraversion: sociability, assertiveness, positive affect.
Agreeableness: trust, altruism, compliance.
Neuroticism: proneness to negative affect; the reverse pole is emotional stability.

Each domain contains narrower facets, and facets often predict specific outcomes better than the domain that contains them. Aggregating to five numbers discards predictive information.

History

The approach begins with the lexical hypothesis: that individual differences important enough to matter become encoded in language. Allport and Odbert catalogued trait terms in 1936; Cattell reduced the list; Tupes and Christal recovered five recurring factors in 1961.

The structure was independently rediscovered several times, which is a large part of why it is taken seriously. Costa and McCrae's NEO instruments and Goldberg's public-domain markers made it the working model from the 1980s.

Theory

Two positions on what the five factors are.

Five-Factor Theory (McCrae and Costa) treats them as biologically based dispositions, largely unaffected by environment, with life experience shaping their expression rather than their level.

Descriptive positions treat them as an efficient summary of covariation in behaviour and self-description, with no commitment to underlying entities.

Competing structures exist. HEXACO adds a sixth factor, honesty-humility, and outperforms the Big Five for predicting exploitative and unethical behaviour. Six-factor solutions recover more consistently in lexical studies across languages than five do.

Research

Well-supported findings:

Conscientiousness predicts job performance across occupations, academic achievement, health behaviour and longevity, and is the most consistently useful single trait.
Neuroticism predicts mental and physical health outcomes and is the strongest trait-level predictor of psychopathology.
Heritability of each domain is estimated around 40 to 60 percent.
Traits are not fixed. Mean-level change continues throughout adulthood — the maturity principle — and personality change is achievable through intervention, including as a side effect of psychotherapy.

The cross-cultural picture is weaker than usually stated. The structure replicates well in literate, industrialised samples. In several small-scale societies — the Tsimane of Bolivia are the best-documented case — the five-factor structure does not recover.

Applications

Personnel selection, where conscientiousness and integrity measures have modest but real validity and where self-report is vulnerable to faking; research on health and life outcomes; clinical formulation, where trait level informs risk and treatment fit.

The DSM-5 alternative model of personality disorders uses a maladaptive-trait model directly descended from this structure.

Criticism

Descriptive, not explanatory. Saying someone behaves conscientiously because they are conscientious is a restatement, not a cause.
Cross-cultural recovery fails in some non-WEIRD samples, which is a problem for any claim about human universals.
Self-report dependence, with reference-group effects making cross-national mean comparisons largely uninterpretable.
Five may be the wrong number. HEXACO's sixth factor has good evidence, and the factors themselves correlate rather than being orthogonal.
Facet-level information is thrown away by domain scoring, and prediction suffers for it.

References

Goldberg, L. R. (1993). The structure of phenotypic personality traits. American Psychologist, 48(1), 26-34.
McCrae, R. R., & Costa, P. T. (1987). Validation of the five-factor model of personality across instruments and observers. Journal of Personality and Social Psychology, 52(1), 81-90.
Ashton, M. C., & Lee, K. (2007). Empirical, theoretical, and practical advantages of the HEXACO model. Personality and Social Psychology Review, 11(2), 150-166.
Gurven, M., et al. (2013). How universal is the Big Five? Journal of Personality and Social Psychology, 104(2), 354-370.
Roberts, B. W., et al. (2017). A systematic review of personality trait change through intervention. Psychological Bulletin, 143(2), 117-141.

Written for PsychologyOrbit and reviewed before publishing. It is a summary for professionals and students, not clinical guidance, and it is not a substitute for the primary sources listed above.