Can Personality Tests Predict Job Success?
Yes, Big Five personality traits predict job performance with effect sizes comparable to cognitive ability tests. Conscientiousness (organization, discipline) shows the strongest correlation across all occupations (r = 0.27), meaning it explains 7% of performance variance. Openness predicts success in creative fields (r = 0.33, 11% variance). A 2019 meta-analysis of 274 studies spanning 100 years confirmed personality is a stable, measurable predictor of career outcomes, not pseudoscience.
Big Five Traits → Job Performance Correlations
| Trait | All Jobs | Best For | Correlation |
|---|---|---|---|
| Conscientiousness | 0.27 | All occupations | Strongest overall |
| Openness | 0.10 | Creative roles | 0.33 |
| Extraversion | 0.13 | Sales, leadership | 0.25 |
| Emotional Stability | 0.11 | High-stress roles | 0.22 |
| Agreeableness | 0.08 | Teamwork roles | 0.15 |
Source: Wilmot & Ones (2019), PNAS. r = correlation coefficient (0.10 = small, 0.30 = medium, 0.50 = large).
The Science: 100 Years of Research
In 2019, researchers Michael Wilmot and Deniz Ones analyzed a century of personality research, 274 independent studies covering 164,000+ workers. Their findings, published in the Proceedings of the National Academy of Sciences (PNAS), settled the debate:
Key Finding:
"Conscientiousness predicts job performance across all occupations, experience levels, and job complexity tiers with remarkable consistency (ρ = 0.27). This effect size rivals cognitive ability and exceeds it in roles requiring sustained effort."
What Does r = 0.27 Mean?
A correlation of 0.27 explains ~7% of performance variance. That may sound small, but:
- It's consistent across all industries (factory work to executive leadership)
- It's stable over decades (your Conscientiousness at 25 predicts success at 50)
- In combination with other traits, it explains 15-20% of variance
Trait-by-Trait Breakdown
1. Conscientiousness: The Universal Predictor
Why it matters: Conscientiousness captures reliability, planning, and goal-directed behavior, traits valued in every job. Whether you're a surgeon, cashier, or software engineer, showing up on time and following through matters.
Career impact: High-Conscientiousness workers earn 10-15% more over their lifetimes and are promoted faster. They're also less likely to be fired (r = -0.20 with counterproductive behavior).
2. Openness: The Creativity Multiplier
Job-specific effect: Openness barely predicts performance in routine roles (r = 0.05) but strongly predicts success in creative, research, and innovation jobs (r = 0.33).
Example: Software engineers, designers, and entrepreneurs with high Openness outperform peers by 15-20% in innovation metrics (patent filings, new product launches).
3. Extraversion: Sales & Leadership Advantage
Extraverts dominate in social interaction roles:
- Sales: r = 0.25 (10% performance variance)
- Management: r = 0.21 (leadership emergence)
- Customer service: r = 0.18
However, Extraversion doesn't predict technical role success (engineers, analysts). Introverts perform equally well in solo work.
4. Emotional Stability (Low Neuroticism)
Critical in high-stress environments: emergency medicine (r = 0.22), military (r = 0.19), customer-facing roles (r = 0.17). Emotionally stable workers handle pressure better and burn out less frequently.
5. Agreeableness: The Double-Edged Trait
Good for teamwork (r = 0.15 with cooperation), bad for earnings. Highly agreeable workers earn 5-10% less because they:
- Negotiate less aggressively
- Avoid conflict (including necessary confrontations)
- Prioritize harmony over self-interest
Real-World Application: Hiring Practices
89% of Fortune 500 companies use personality assessments in hiring (SHRM 2023 survey). Most use Big Five-based tests because:
✓ Legal & Validated
Big Five tests survive legal challenges because they're job-related and don't discriminate by protected class.
✓ Predictive
Combining Conscientiousness + cognitive tests increases hiring success by 25%.
✓ Cost-Effective
Online tests cost $5-20/candidate vs $500+ for assessment centers.
✓ Scalable
Screen 10,000 applicants with automated scoring in hours.
Limitations & Misuse
⚠️ What Tests Can't Do
- ✗Replace job skills: A conscientious person without coding skills won't succeed as a developer
- ✗Predict rare events: Tests don't predict workplace violence or ethical breaches well
- ✗Account for context: A great employee at Company A may fail at Company B due to culture mismatch
Discover Your Career Strengths
Take the Big Five test to see which traits predict your success. Free percentile-based results in 10 minutes.
Take Big Five Test →Frequently Asked Questions
Do personality tests really predict job performance?
Yes. Meta-analysis of 274 studies found Big Five Conscientiousness predicts job success across all occupations (r = 0.27), comparable to cognitive ability tests. Openness predicts creative role success (r = 0.33).
Which personality trait is the best predictor of career success?
Conscientiousness, organization, discipline, and reliability. It predicts performance in 100% of studied occupations, from entry-level to executive roles (Wilmot & Ones, 2019).
Can employers use personality tests for hiring?
Yes, legally, if tests are job-related and validated. 89% of Fortune 500 companies use Big Five assessments. MBTI is discouraged for hiring due to lower validity and discrimination risk.
What's the correlation between personality and salary?
Conscientiousness correlates 0.15-0.20 with lifetime earnings. Extraversion boosts sales/leadership salaries by 10-15%. Agreeableness actually reduces earnings (negotiation disadvantage).
Sources
- Wilmot, M. P., & Ones, D. S. (2019). A century of research on conscientiousness at work. PNAS, 116(46), 23004-23010.
- Judge, T. A., et al. (2010). The relationship between pay and job satisfaction: A meta-analysis. Journal of Vocational Behavior, 77(2), 157-167.
- SHRM. (2023). Talent acquisition benchmarking report.