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In page Early childhood education:

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Jean Piaget's constructivist theory gained influence in the 1970s and '80s. Although Piaget himself was primarily interested in a descriptive psychology of cognitive development, he also laid the groundwork for a constructivist theory of learning.[1] Piaget believed that learning comes from within: children construct their own knowledge of the world through experience and subsequent reflection. He said that "if logic itself is created rather than being inborn, it follows that the first task of education is to form reasoning." Within Piaget's framework, teachers should guide children in acquiring their own knowledge rather than simply transferring knowledge.[2]