Big Five Personality Traits

The Big Five is the model I-O psychologists use; MBTI is the model many corporate workshops use.

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The five traits at a glance

Trait	What it measures	High scorer	Low scorer	Strongest workplace correlate
Openness	Intellectual curiosity, imagination, willingness to try new experiences	Creative, abstract, exploratory, comfortable with ambiguity	Practical, structured, prefers proven methods	Innovation, strategy, R&D roles; adaptability
Conscientiousness	Self-discipline, dependability, goal-directedness, organisation	Reliable, organised, deadline-meeting, detail-oriented	Flexible, spontaneous, may struggle with structure	Consistently the strongest Big Five predictor of job performance across role types
Extraversion	Where energy is drawn – external stimulation vs internal reflection	Outgoing, assertive, comfortable in groups, energy from social interaction	Reflective, independent worker, energy from focused work	Customer-facing roles, sales, leadership
Agreeableness	Cooperativeness, empathy, trust	Cooperative, empathetic, considerate, conflict-averse	Direct, competitive, willing to disagree	Team collaboration, service roles; high may underperform in roles requiring tough decisions
Neuroticism	Tendency toward negative emotion, anxiety, emotional reactivity	Sensitive to stress, more variable mood, may catastrophise	Emotionally stable, resilient under pressure, even-keeled	Low neuroticism predicts performance in high-stress roles

Where the big five came from

The Big Five emerged not from a single theorist’s framework but from decades of factor-analytic research on personality descriptors in human language – the ‘lexical hypothesis’ that important personality dimensions become encoded in everyday vocabulary. Researchers Tupes and Christal (1961), Norman (1963), and later Goldberg (1981, 1993), Costa and McCrae (1992) progressively distilled thousands of trait words into the five dimensions that recurred reliably. The model has been replicated across English, German, Dutch, Chinese, Filipino, Korean, Italian, Czech, Polish, Russian, and dozens of other languages.

This empirical, atheoretical origin distinguishes Big Five from frameworks like MBTI (developed from Jungian theory without empirical replication) or DISC (a four-factor commercial model). The Big Five is the model I-O psychologists use; MBTI is the model many corporate workshops use.

Predictive validity: what the big five predicts at work

Barrick and Mount’s 1991 meta-analysis in Personnel Psychology remains the canonical reference on Big Five and job performance. Key findings, replicated repeatedly since:

• Conscientiousness is the strongest Big Five predictor of job performance across virtually all occupational groups. Typical predictive validity around r = 0.20-0.25 – modest in absolute terms but substantial relative to other personality predictors.
• Extraversion predicts performance in roles requiring social interaction. Sales, customer service, and leadership roles.
• Openness predicts performance in roles requiring learning, adaptation, and creativity. Training success, innovation roles.
• Emotional stability (low neuroticism) predicts performance in high-stress roles and general counterproductive work behaviour.
• Agreeableness has the most context-dependent predictive validity. Positive for teamwork and service; can be negative in roles requiring tough decisions.

Practical implication: cognitive ability tests typically predict job performance at r = 0.40-0.50 (twice the predictive power of any single personality trait). Best practice in selection is to combine cognitive assessment with Big Five personality assessment plus structured interview – multi-method assessment substantially outperforms any single tool. See construct validity for the validation framework.

Big five vs MBTI vs DISC: how to choose

Dimension	Big Five (OCEAN)	MBTI (Myers-Briggs)	DISC
Structure	Dimensional (continuums)	Categorical (16 types)	Categorical (4 styles)
Empirical foundation	Strong – factor-analytic, cross-cultural	Weak – derived from Jungian theory; replicability disputed	Limited; commercial origin
Test-retest reliability	High (r ~0.85)	Moderate – many test-takers get different types on retest	Moderate
Predictive validity for job performance	Modest but real, especially Conscientiousness	Limited evidence	Limited evidence
EEOC defensibility (high-stakes selection)	Strong if validated locally	Weak – even MBTI publisher discourages selection use	Weak
Common workplace use	Hiring, development, research	Team workshops, self-awareness	Team workshops, sales training

Practical rule: if a personality test will inform consequential employment decisions (hiring, promotion, succession), use the Big Five with documented validity evidence. If supporting team workshops and self-awareness, MBTI or DISC are acceptable – but should not be used for selection. Per SIOP Principles for the Validation and Use of Personnel Selection Procedures, personality assessments used for consequential decisions should meet documented validity standards.

How to use big five in hiring (and how not to)

Use it for

• Adding signal to selection decisions, alongside cognitive ability and structured interviews. Multi-method assessment outperforms any single tool.
• Role-specific calibration. High conscientiousness for detail-driven roles, high openness for innovation roles, low neuroticism for high-stress roles – adjusted per job analysis.
• Team composition planning. Awareness of team trait distribution helps managers understand collaboration dynamics.
• Development and coaching. Self-awareness, feedback framing, and capability-building conversations.

Do not use it for

• Sole-source hiring decisions. Predictive validity is real but modest.
• Cut-score selection without validation. Setting ‘must score X on Conscientiousness’ without validation evidence is indefensible under job relatedness standards.
• Decisions on protected classes without adverse-impact analysis. Personality trait distributions can differ across demographic groups; adverse-impact analysis is mandatory before selection use.

Faking, social desirability, and lie scales

All personality assessments are vulnerable to faking – test-takers presenting themselves in a more favourable light in high-stakes selection contexts. Research shows applicants typically score 0.5-1.0 standard deviation higher on socially desirable traits (conscientiousness, low neuroticism) than incumbents on the same instrument. Mitigations:

• Forced-choice item formats. Test-takers choose between equally desirable options, reducing the option to ‘fake good’ on all items.
• Lie scales or social desirability indices. Items embedded in the test detect implausibly favourable response patterns.
• Multiple assessment methods. Combining personality with cognitive tests, structured interviews, and work samples reduces single-source faking impact. See first impression error for the cognitive-bias context.

EEOC compliance and big five assessments

Personality assessments are ‘selection procedures’ under EEOC Uniform Guidelines on Employee Selection Procedures (29 CFR Part 1607). They must be job-related and consistent with business necessity, and they must not produce adverse impact on protected classes. Use only validated assessments with technical manuals showing construct validity, criterion-related validity, and reliability. Run adverse-impact analysis on selection rates by protected class. Re-validate periodically – populations and roles drift. Use Testlify’s validated personality assessments which include documentation suitable for EEOC defensibility.

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