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In page Melanie Klein:

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Klein's approach differed from Anna Freud's ego-psychology approach. Klein explored the interpersonal aspect of the structural model. In the mid-1920s, she thought differently about the first mode of defense. Klein thought it was expulsion while Freud speculated it was repression (Stein, 1990). Klein suggested that the infant could relate—from birth—to its mother, who was deemed either "good" or "bad" and internalized as archaic part-object, thereby developing a phantasy life in the infant. Because of this supposition, Klein's beliefs required her to proclaim that an ego exists from birth, enabling the infant to relate to others early in life (Likierman & Urban, 1999).[citation needed]