The Eysenck Personality Inventory (EPI) is a psychological assessment tool developed by psychologist Hans Eysenck. It measures two primary dimensions of personality: extraversion and neuroticism. The inventory consists of a series of true or false questions that help categorize individuals based on their responses, providing insights into their personality traits. The EPI is widely used in various settings, including clinical psychology and organizational environments, to understand behavior and predict how individuals may respond in different situations. By identifying personality types, the EPI can assist in personal development and improve interpersonal relationships.