If you've ever taken a personality quiz online, it probably sorted you into a type. Scientific personality research works differently: instead of boxes, it uses scales, and most people land somewhere in the middle of each.
Where the Big Five came from
Researchers took the thousands of words people use to describe each other ("organised", "chatty", "kind", "moody") and looked for which ones tend to go together. Again and again, across many languages, they clustered into five broad groups. These became the Big Five, often remembered as OCEAN:
- Openness: curious and imaginative, or practical and fond of the familiar.
- Conscientiousness: organised and disciplined, or flexible and spontaneous.
- Extraversion: outgoing and energised by people, or quieter and recharged by time alone.
- Agreeableness: warm and cooperative, or competitive and sceptical.
- Neuroticism: prone to worry and stress, or emotionally steady.
None of these ends is "good" or "bad". A low-agreeableness person might make a sharp negotiator; a high-neuroticism person might spot risks others miss.
What traits predict
Traits are surprisingly useful. Conscientiousness is the best personality predictor of how well people do at school and work. Extraversion relates to how much positive emotion people feel, and neuroticism to how much stress they report.
Can personality change?
Partly. Twin studies suggest that around 40–50% of the differences between people are linked to genes. Traits are fairly stable from year to year, but they shift across life: on average people grow more conscientious and agreeable and calmer with age. This is called the maturity principle.
What about the MBTI?
The Myers–Briggs test is hugely popular, but psychologists are sceptical. It splits each trait into two types, so someone just either side of a cut-off can get a different result when they retake it. The Big Five's scales give more consistent results and predict more.
And be wary of any description that feels uncannily accurate: vague statements that fit almost everyone tend to feel personal. That's the Barnum effect, and it's the secret of most horoscopes.
Try it
The cards below cover each trait, what it predicts, and the difference between types and traits.