Should Companies Use Personality Tests for Hiring?
Short Answer
Personality tests in hiring have mixed research support: some evidence they predict job performance and team fit when properly validated, but significant risk of bias, false positives, and legal exposure in many jurisdictions. The DISC Profile, Big Five, and MBTI are common; validity depends on job relevance and test selection. JobCannon's DISC Profile helps companies assess personality fit with proper guardrails.
Full Answer
Personality testing in hiring is controversial because outcomes hinge entirely on implementation quality. When used well, personality assessment provides insight into candidate work style and team compatibility. When used poorly, personality tests become pseudoscientific gatekeeping that discriminates against neurodivergent, introverted, or culturally different candidates.
The business case: Research shows personality traits correlate with job performance in specific roles. Conscientiousness predicts overall performance; agreeableness predicts team collaboration; openness predicts creativity and learning. Someone hiring for a relationship-intensive sales role might legitimately screen for higher extraversion and agreeableness. Someone hiring for research roles might value openness and low conscientiousness for creative thinking. When traits are job-relevant, personality assessment adds signal.
The risks and limitations: Personality is stable but not performance-deterministic. A low-agreeableness candidate might be the best engineer but struggle in collaborative environments. An introverted candidate might lead brilliant meetings once comfortable. Personality tests can't predict motivation, commitment, or skill. They also inherently bias against neurodivergent candidates: ADHD people score higher on conscientiousness measures (impulsivity bias), autistic people score lower on extraversion and agreeableness (different social style, not lack of collaboration), creating structural discrimination.
Legal and ethical boundaries: In many jurisdictions, using personality tests for hiring is legal but carries compliance risk. The EEOC requires personality tests to be validated for the specific job (not just "we use this for all roles"). Disability discrimination law means personality traits that correlate with disability status (introversion, anxiety sensitivity) can't be disqualifying.
Best practice: Personality assessment is most defensible when: (1) traits are job-relevant and validated, (2) personality results are one input among many (not disqualifying), (3) tests are culturally validated, (4) neurodivergent and disabled candidates aren't systematically disadvantaged, (5) scoring isn't opaque or pseudoscientific.
JobCannon's DISC Profile provides structured personality assessment with transparency about what traits predict which job outcomes.
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Do personality tests predict job performance?▼
Partially. Personality traits correlate with performance in specific jobs (conscientiousness predicts overall performance, openness predicts learning, extraversion predicts sales), but correlation is moderate and isn't destiny. A high-performing candidate might have non-ideal personality traits, or ideal personality with poor execution. Personality is one signal, not predictive alone.
Can personality tests discriminate against neurodivergent people?▼
Yes, easily. Introversion bias (penalizing low extraversion), agreeableness bias (penalizing directness, which autistic people value), and conscientiousness bias (ADHD = high impulsivity scores) create structural discrimination. Ethical personality testing accounts for neurodivergence and avoids disqualifying candidates based on traits linked to disability.
Is MBTI valid for hiring?▼
MBTI is popular but has limited research support for predicting job performance. It's better as a communication tool than a selection tool. Big Five and DISC have stronger research support. If using MBTI for hiring, treat results as exploratory, not definitive, and supplement with other assessments.