This document provides an overview of key concepts in personality psychology, including: 1) Freud's psychoanalytic theory of personality comprising the id, ego, and superego, as well as his psychosexual stages of development. 2) Modifications to Freud's theory by Jung, Adler, Horney, and Erikson. 3) Behaviorist, humanistic, and trait theories of personality. 4) Methods of measuring personality including interviews, projective tests, behavioral assessments, and personality inventories.