The Big Five

The Big Five grew out of a simple idea: if a difference between people matters, language will have a word for it. From the 1930s onward, researchers collected thousands of trait adjectives and analyzed how people rated themselves and others on them. Across languages, cultures and methods, the same five broad clusters kept appearing (Goldberg, 1993).

The traits are usually remembered as OCEAN: Openness, Conscientiousness, Extraversion, Agreeableness and Neuroticism. Unlike types, each is a continuous dimension on which most people land somewhere near the middle.

Big Five scores are linked with real outcomes: Conscientiousness with job performance and health habits, Neuroticism with wellbeing and mental health, Extraversion with positive mood and social connection, Agreeableness with the quality of relationships, and Openness with creativity and changing interests. A large replication project found that most published links between the traits and life outcomes held up in new samples, though often a little weaker than first reported (Soto, 2019).

The effects are real but modest. Traits shift the odds; they do not decide anyone's fate.

Slowly, and in a fairly predictable direction. On average, people become more conscientious and agreeable and less neurotic between young adulthood and middle age, a pattern sometimes called the maturity principle (Roberts, Walton and Viechtbauer, 2006). Where you stand relative to other people your age is more stable than your absolute scores.

Each Koseiha scale lines up with one Big Five trait, so the same answers produce both your type and your Big Five estimates. Because our scales were written around the type preferences, the Big Five scores are approximations: a 50 is the middle of the scale, not the population average. A dedicated Big Five inventory would measure the traits more precisely. See exactly how the estimates are made.