In simple terms
The Big Five, also called the five-factor model, is a widely used way to describe personality in research. It groups the many ways people differ into five broad traits.
Each trait is a scale, not a box. Everyone sits somewhere between the two ends of every trait.
How it works
The five traits, with the kinds of qualities they capture, are:
- Openness to experience: being creative, imaginative and reflective.
- Conscientiousness: being dutiful, organized and reliable.
- Extraversion: being active, assertive and talkative.
- Agreeableness: being generous, gentle and kind.
- Neuroticism: a tendency to feel anxious, irritable or low in mood.
Researchers measure the traits with questionnaires in which people rate how well statements describe them. The model grew out of studies of the everyday words people use to describe each other, and it was later supported by purpose-built questionnaires.
It has been tested well beyond Europe and North America. A 2007 study of 17,837 people in 56 nations, using a questionnaire translated into 28 languages, found the five-trait structure held up across major world regions.
Why it matters
The Big Five give researchers a shared language for comparing personality across studies, countries and cultures. That makes it possible to pool results from very large groups.
In September 2026, a study in Nature combined data from up to 1.14 million people and found 1,260 genetic variants linked to the traits. Together, common variants explained only a modest share of the differences in trait scores, roughly 5 to 13% depending on the measure. Each single variant had a tiny effect.
Where you’ll see it
- Psychology research and textbooks.
- Questionnaires such as the Big Five Inventory.
- Studies comparing personality across countries.
- Science news on genetics and personality.
Example
She scored high on conscientiousness and low on extraversion, which fit her love of careful planning and quiet evenings.
Often confused with
Personality types. Type systems sort people into a few categories. The Big Five instead place each person along five separate dimensions.
Key facts
- The five-factor model organizes personality traits into five basic dimensions: extraversion, agreeableness, conscientiousness, neuroticism and openness to experience.1
- Support for the model comes from research on everyday descriptive adjectives and from theory-based questionnaires.1
- A 2007 study of 17,837 people from 56 nations, using the Big Five Inventory in 28 languages, found the five-factor structure robust across major world regions.2
- A 2026 Nature study of 611,037 to 1.14 million participants identified 1,260 lead genetic variants linked to personality, including 824 not reported before.3
- In that study, common genetic variants explained 4.8 to 9.3% of the variance in each trait, and 9.3 to 13.3% for measures with typical reliability.3
Quick checkWhich Big Five trait describes a tendency toward anxiety and irritability?Show answer
Neuroticism.
Sources
- Journal of Personality (McCrae RR, John OP), via PubMed. An introduction to the five-factor model and its applications. June 1992 (accessed 11 September 2026)
- Journal of Cross-Cultural Psychology (Schmitt DP, Allik J, McCrae RR, Benet-Martínez V), author-hosted copy. The geographic distribution of Big Five personality traits: patterns and profiles of human self-description across 56 nations. March 2007 (accessed 11 September 2026)
- Nature (Schwaba T, Clapp Sullivan ML, Akingbuwa WA and others). Robust inference and correlates from genetic associations with personality. 2 September 2026 (accessed 11 September 2026)
- Nature (Ewen Callaway), news. Anxious or outgoing? Huge study links Big Five personality traits to genetic variants. 2 September 2026 (accessed 11 September 2026)
Editorially reviewed by Specialty Digest Editorial TeamLast reviewed September 11, 2026Researched and drafted with AI assistanceReport an issue