Research Brief

How Intelligence Predicts Professional Achievement

Abstract

Cognitive ability is the strongest single predictor of job performance and career success across virtually all occupations.

Correlation Data

Positive Correlation

Consensus: Extremely robust. Schmidt & Hunter (1998) meta-analysis: cognitive ability r ≈ 0.51 for job performance.

Variable Y: Career Success

Variable X: High IQ

Biological Mechanism

Higher processing speed, working memory capacity, and ability to learn complex information quickly.

Scientific Explanation

Higher IQ enables faster learning of new skills, better problem-solving, more effective handling of complexity, and adaptation to changing job demands. Effect strongest for complex jobs.

Real World Examples

Top performers in cognitively demanding fields (science, law, medicine) reliably score higher on cognitive tests.

Advisory Protocol

IQ isn't everything—conscientiousness, emotional intelligence, and domain expertise also matter greatly. Build multiple forms of capital.

References & Literature

Schmidt & Hunter (1998)
Gottfredson (1997)
Judge et al. (1999)

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