was first developed by the British psychologist Sybil B. G. Eysenck and Hans Eysenck. It was a self-reported test designed to work with both adolescents and adults, consisting of 57 yes-no questions.
EYSENCK PERSONALITY INVENTORY EPI: “One of the best known creations by the British psychologist Sybil B. G. Eysenck and Hans Eysenck, was the Eysenck personality inventory.”