Peter is a psychologist who used to think that people were limited by their pasts. however, he changed his way of thinking and now believes that people can grow to reach their full potential, despite their past. peter has changed from a psychoanalytic to a approach.

The answer is Peter has changed from a psychoanalytic to a developmental approach.

Explanation:

Developmental psychologists view development as a lifelong process that can be examined across three domains: physical, cognitive development, and the psychosocial. Developmental psychologists use their knowledge of how people mature at different life stages so they can intervene in different  factors that may upset that change and growth. By understanding the specific milestones that generally take place at each stage of a person's development, developmental psychologists can better identify when children may need special assistance or when adults might need intervention later in life as well.