__________ based his developmental theory on observations of people from many cultures and socioeconomic strata,and upon historical figures.

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Erik Erikson based his developmental theory on observations of people from many cultures and socioeconomic strata, and upon historical figures. Sigmund Freud based his theory on clinical observations and case studies of his patients, while Jean Piaget based his theory on observing how children learn and develop. Daniel Levinson based his theory on interviews with middle-aged men in the United States.

__________ Based His Developmental Theory on Observations of People from Many