Final answer:
Erik Erikson developed an interest in psychosocial development through his work with Anna Freud. He proposed a theory of personality development that emphasized the role of social relationships. Successful completion of developmental tasks is crucial for a healthy personality.
Step-by-step explanation:
Erik Erikson, influenced by his work and analysis with Anna Freud, developed an interest in psychosocial development. He proposed a theory of personality development that emphasized the importance of social relationships at each stage of development. Unlike Freud's focus on sex, Erikson believed that successful completion of developmental tasks is essential for the development of a healthy personality and a sense of competence.