What is Hans eysenck big contribution?

Hans Eysenck was a prominent psychologist known for his work in personality theory and psychometrics. His major contribution was the development of the Eysenck Personality Questionnaire (EPQ), which identified three primary dimensions of personality: extraversion, neuroticism, and psychoticism. He also emphasized the biological basis of personality traits, arguing that genetics plays a significant role in shaping individual differences. Eysenck's research has had a lasting impact on psychology, influencing both personality assessment and the understanding of behavior.