The Eysenck Personality Questionnaire (EPQ) is a psychological assessment tool developed by psychologist Hans Eysenck. It measures personality traits based on his theory of personality, which includes three main dimensions: extraversion, neuroticism, and psychoticism. The questionnaire consists of a series of true or false questions that help categorize individuals into these personality dimensions. The EPQ is widely used in both clinical and research settings to understand personality differences and predict behavior. It provides insights into how individuals may respond to various situations, making it a valuable tool for psychologists and researchers studying personality and behavior.