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General Personality Science

Five Factor Model (FFM)

The scientific framework behind the Big Five personality test. Developed through decades of factor analysis, identifying five broad dimensions that account for most of the variance in human personality.

The Five Factor Model (FFM) emerged from the "lexical hypothesis" — the idea that the most important personality differences are encoded in language. Researchers analyzed thousands of personality-describing words across cultures and consistently found five broad factors.

The five factors — Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism (OCEAN) — have been replicated across 50+ countries and dozens of languages. The FFM is used in ~90% of personality research published since 1990.

Key researchers: Lewis Goldberg (coined "Big Five"), Paul Costa & Robert McCrae (developed the NEO-PI-R, the gold-standard FFM measure), and the IPIP (International Personality Item Pool) which provides free, validated items.

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Related Terms

Introversion
A personality preference for lower stimulation environments. Introverts recharge through solitude and deep focus, prefer small groups over large parties, and think before speaking.
Personality Trait
A relatively stable pattern of thoughts, feelings, and behaviors that distinguishes one person from another. Traits are continuous dimensions (not categories) measured on a spectrum.
Ambivert
A person who falls near the middle of the introversion-extraversion spectrum, displaying both introverted and extroverted behaviors depending on context. Most people (60-70%) are ambiverts.
Dark Triad
Three socially aversive personality traits: Narcissism (grandiosity, entitlement), Machiavellianism (manipulation, cynicism), and Psychopathy (callousness, impulsivity). Present to varying degrees in the general population.
Highly Sensitive Person (HSP)
A personality trait found in 15-20% of the population, characterized by deeper sensory processing, emotional sensitivity, and heightened responsiveness to stimuli. Identified by Elaine Aron (1996).
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