Before revision: Freud (1856–1939) developed a three-part model of the psyche comprising the Id (), the Ego (), and the superego ( .Freud, 1923 Freud's self-concept influenced Erikson (1902–1994), who emphasized self-identity crisis and self-development.
After revision: )Freud (1856–1939) developed a three-part model of the psyche comprising the Id (), the Ego (), and the superego ( .Freud, 1923 Freud's self-concept influenced Erikson (1902–1994), who emphasized self-identity crisis and self-development.