HEXACO

framework · psychology · structured-empirical

Six-factor personality model adding Honesty-Humility to the Big Five.

The HEXACO model of personality, developed by Kibeom Lee and Michael Ashton beginning in the early 2000s, emerged from lexical studies of personality structure across multiple languages that consistently surfaced six rather than five dimensions: Honesty-Humility (H), Emotionality (E), Extraversion (X), Agreeableness (A), Conscientiousness (C), and Openness to Experience (O). The H factor — capturing sincerity, fairness, greed avoidance, and modesty — is HEXACO's distinctive contribution beyond the Five-Factor Model, with substantial subsequent research showing that low H predicts dishonesty, exploitation, and dark-triad traits (Machiavellianism, narcissism, psychopathy) better than any Big Five factor. The HEXACO Personality Inventory (HEXACO-PI-R) is the canonical instrument. While the Big Five remains more widely used in industrial-organizational psychology, HEXACO has gained traction particularly in research on dark personality and ethical behavior.

Originators

Kibeom Lee; Michael C. Ashton high

Year / Decade

Early 2000s development; 2004 (Lee & Ashton paper); 2007 (revised HEXACO-PI-R) high

Primary sources

Lee, K. & Ashton, M.C. (2004). 'Psychometric Properties of the HEXACO Personality Inventory', Multivariate Behavioral Research, Ashton, M.C. & Lee, K. (2007). 'Empirical, theoretical, and practical advantages of the HEXACO model of personality structure', Personality and Social Psychology Review high

Core components

Six dimensions: Honesty-Humility (H), Emotionality (E), eXtraversion (X), Agreeableness (A), Conscientiousness (C), Openness (O)
Each factor with four facets
Lexical-study foundation across multiple languages
HEXACO-PI-R inventory
Distinctive H factor predicting dark-triad and ethical behavior
Reframing of Agreeableness and Emotionality vs Big Five

Primary use case

Personality research, particularly on dark personality, ethical behavior, and counterproductive workplace behavior; alternative to Big Five in cross-cultural personality research; selection contexts where integrity prediction matters; academic personality assessment.

Common criticisms

Less widely used than Five-Factor Model in industrial-organizational and clinical contexts, limiting normative comparison data
the H factor's distinctness from low Big Five Agreeableness contested by some researchers
cultural variation in lexical extraction of the sixth factor
inventory length can be a practical obstacle
less-established meta-analytic evidence than Big Five for predicting work outcomes
Emotionality's reframing (vs Big Five Neuroticism) creates translation issues with established literature.

Lineage

Siblings: Big Five
Derived from: Big Five