According to Ernst von Glasersfeld, Jean Piaget is " the great pioneer of the constructivist theory of knowing.

According to Ernst von Glasersfeld, Jean Piaget is " the great pioneer of the constructivist theory of knowing " ( in An Exposition of Constructivism: Why Some Like it Radical, 1990 ) and " the most prolific constructivist in our century " ( in Aspects of Radical Constructivism, 1996 ).

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