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Alexander Kapp - the first known user of the andragogy concept
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Period: to
ean Piaget develops cognitive theory
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John B. Watson studies an 11 month old child, concluding that classical conditioning could cause phobias in humans.
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Eduard C. Lindeman - publishes The Meaning of Adult Education:
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B.F. Skinner introduces the Operant Conditioning Model
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Jerome Bruner's The Process of Education has a great influence on education in the U.S.
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Fred Keller - develops The Keller Plan
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John D. Ingalls and Joseph M. Marceri publish A Trainer's Guide to Andragogy
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Lev Vygotsky's work is published by Harvard University Press
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Jack Mezirow proposes "Charter for Andragogy"