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00638_Field_ML PU T57.txt
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1996-04-10
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Jean Piaget (1896­1980) was the Swiss psychologist who identified the
four stages of mental growth in children. His work had a major impact
on both education and psychology. Piaget obtained his PhD in biology
at the age of 22, then studied psychology in Zurich and at the
Sorbonne in Paris, where he did research into cognitive abilities. In 1955
he was appointed director of the International Bureau of Education.