If you have taken a personality test in the last two decades, you have probably encountered the Big Five model. Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism — the OCEAN framework — have dominated personality psychology for over 30 years. It is the most scientifically validated model researchers have, and it shows up everywhere from academic journals to corporate hiring pipelines.
But here is something most people do not know: the Big Five is not the end of the story. In the early 2000s, two Canadian psychologists — Kibeom Lee and Michael Ashton — published research suggesting that personality actually has six major dimensions, not five. They called their model HEXACO, and the sixth factor they added is called Honesty-Humility.
The addition of one trait might sound like a minor academic tweak. In practice, it changes how we understand character, cooperation, and why some people exploit others while some do not. This article explores what the HEXACO model is, how it differs from the Big Five, and why Honesty-Humility matters far more than most people realize.
Where the HEXACO Model Came From
The Big Five was built through a method called lexical analysis — researchers combed through dictionaries, collecting thousands of adjectives people use to describe themselves and others. Words like “organized,” “talkative,” “anxious,” “kind,” and “curious” naturally clustered into five broad factors. Decades of factor analysis across different languages and cultures confirmed this five-factor structure, and the Big Five became the consensus model of personality.
But Lee and Ashton noticed something. When they re-ran lexical studies using more languages and more sophisticated statistical techniques, a sixth cluster kept emerging. Words like “sincere,” “fair,” “modest,” and “honest” grouped together, and they grouped separately from the standard Agreeableness factor. Similarly, traits like “greedy,” “pretentious,” “manipulative,” and “self-important” formed their own cluster at the opposite end.
Earlier Big Five research had essentially folded these traits into Agreeableness, but Lee and Ashton’s cross-cultural analysis showed they represented a distinct dimension. The HEXACO model was born: six factors instead of five, with Honesty-Humility (H) standing alongside Emotionality (E), Extraversion (X), Agreeableness (A), Conscientiousness (C), and Openness to Experience (O).
What Honesty-Humility Actually Measures
Honesty-Humility is not about whether you tell the truth in a courtroom or whether you brag about your accomplishments at parties. It is a broader personality dimension that captures the degree to which a person is willing to exploit others for personal gain.
The HEXACO-PI-R, the standard 100-item inventory for measuring the model, breaks Honesty-Humility into four facets:
- Sincerity — being genuine in relationships rather than using flattery or deception to get what you want
- Fairness — avoiding fraud, corruption, and cheating; preferring equitable outcomes
- Greed Avoidance — being uninterested in wealth, luxury goods, and status symbols
- Modesty — viewing yourself as ordinary rather than entitled or superior to others
People who score high on Honesty-Humility tend to be straightforward, content with what they have, and genuinely uninterested in manipulating others for personal advantage. They do not need to be the center of attention, and they feel uncomfortable with displays of wealth or status. People who score low are more likely to flatter, scheme, bend rules, and feel entitled to special treatment.
This is distinct from Agreeableness, which in the HEXACO model is redefined more narrowly. HEXACO Agreeableness measures reactive cooperation — how patient and forgiving you are when someone has already wronged you. Honesty-Humility measures proactive cooperation — whether you are inclined to exploit others in the first place. A person can be agreeable (quick to forgive) but low in Honesty-Humility (willing to cheat), or vice versa.
How HEXACO Reorganizes the Other Five Factors
Beyond adding Honesty-Humility, the HEXACO model redefines some of the other factors in ways worth understanding:
Emotionality replaces Neuroticism but is not identical to it. HEXACO Emotionality includes anxiety and fearfulness (similar to Neuroticism), but it also captures sentimentality, dependence, and emotional sensitivity — traits that the Big Five distributes across different factors. A person high in Emotionality feels things deeply, forms strong emotional attachments, and experiences fear in response to real danger.
Agreeableness in HEXACO is narrower than in the Big Five. It focuses on forgiveness, gentleness, flexibility, and patience — specifically, how you react when someone has treated you poorly. The warmth and empathy components that the Big Five includes in Agreeableness are partly moved to Emotionality and Extraversion in HEXACO.
Extraversion, Conscientiousness, and Openness remain broadly similar to their Big Five counterparts, though the specific facets within each differ slightly. The key shift is that Honesty-Humility and the reorganized Agreeableness together capture the moral and cooperative dimensions of personality more precisely than the Big Five ever did.
Why Honesty-Humility Predicts Real-World Outcomes
If a personality dimension matters, it should predict something about how people actually behave. Honesty-Humility does — and in some cases, it predicts better than any of the Big Five traits.
Research has linked low Honesty-Humility to a range of antisocial and unethical behaviors: counterproductive workplace behavior, academic cheating, theft, fraud, and even criminal convictions. A meta-analysis published in the Journal of Personality found that Honesty-Humility was the strongest personality predictor of workplace deviance, outperforming Conscientiousness and Agreeableness. Studies have also shown that low Honesty-Humility correlates with the Dark Triad traits — narcissism, Machiavellianism, and psychopathy — making it a useful single-indicator screen for socially aversive personality patterns.
On the positive side, high Honesty-Humility predicts ethical decision-making, prosocial behavior, and resistance to corruption. People high in this trait are less likely to offer or accept bribes, more likely to return found money, and more cooperative in economic games where they could easily exploit a partner. In romantic relationships, high Honesty-Humility is associated with greater commitment and lower likelihood of infidelity. In the workplace, it predicts organizational citizenship — doing the right thing even when nobody is watching.
What makes Honesty-Humility particularly useful is that it captures something the Big Five does not cleanly measure. A person can be highly conscientious, agreeable, and emotionally stable, and still be manipulative or dishonest in ways that matter. The HEXACO model catches what the Big Five misses.
The Cross-Cultural Evidence
One of the strongest arguments for the HEXACO model is that the six-factor structure has been replicated across multiple languages and cultures. Lexical studies in Dutch, German, French, Italian, Korean, Hungarian, Polish, and other languages have all found evidence for a sixth factor resembling Honesty-Humility. This cross-cultural consistency suggests the trait is not a statistical artifact or a Western cultural bias — it appears to be a genuine dimension of human personality variation.
That said, the Big Five remains the dominant model in academic psychology, and the debate between five-factor and six-factor advocates continues. Some researchers argue that Honesty-Humility is simply a rotated version of Agreeableness, not a truly independent factor. Others point out that the practical gains from adding a sixth factor may be modest for most applications. The consensus is shifting, however, and HEXACO is increasingly taught alongside the Big Five in personality psychology courses.
What This Means for Personality Testing
If you are someone who takes personality tests out of curiosity or for personal growth, the HEXACO model offers a richer picture than the Big Five alone. It forces you to ask questions the Big Five does not: How honest am I, really? Do I treat people fairly when I could get away with treating them unfairly? Am I drawn to wealth and status for their own sake, or do I find meaning elsewhere?
For those interested in exploring their own personality profile, several platforms offer assessments based on the Big Five and related frameworks. Websites like personalitree.com provide free personality tests that help you understand your trait profile, including the Big Five dimensions that overlap with HEXACO. While most publicly available tests still use the five-factor framework, understanding the HEXACO model gives you a more complete conceptual toolkit for interpreting your results — you can ask yourself whether the trait descriptions you receive capture the full picture of your character, or whether something important might be missing.
If you want to take the actual HEXACO-PI-R, the official 100-item inventory is available through academic channels, and shorter 60-item and 24-item versions exist for research and personal use. Some platforms like personalitree.com offer Big Five and 16-type assessments that can serve as a useful starting point before you dive deeper into the six-factor model.
Practical Takeaways
You do not need to switch loyalty from the Big Five to HEXACO overnight. The Big Five is still a robust, well-validated model, and for most everyday purposes, five factors are enough. But the HEXACO model adds something valuable: it puts moral character — sincerity, fairness, humility — at the center of personality science, where it arguably belongs.
Here are a few practical takeaways:
- When evaluating personality tests, check whether the model they use captures character-relevant traits like honesty and fairness, not just social style and emotional tendencies.
- In workplace or team settings, Honesty-Humility may be a better predictor of trustworthiness and ethical behavior than Conscientiousness or Agreeableness alone.
- For personal growth, reflecting on your own Honesty-Humility — your relationship with sincerity, fairness, material desires, and humility — can reveal blind spots that the Big Five might not surface.
- Remember that no model is final. Personality psychology is a living science. The Big Five was an improvement on earlier models, HEXACO is an improvement on the Big Five, and future models will likely build on both.
The story of the HEXACO model is a reminder that personality science is not static. What we measure shapes what we see, and adding a sixth lens — one focused on character — changes the picture in ways that matter.