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Constructivism is one of the most all-encompassing theories ever created. It does all things for all people. For children, it constructs new knowledge.
In practical terms, it forbids teaching. Teachers must be passive facilitators. (The reasoning is that if a teacher tells something directly to students, the students can no longer create their own new knowledge. It's already been done for them. And that's bad.)
Constructivism is a big soft cloud of theory.
This article tries to give a better sense of this hugely pervasive theory.
K-12: How Constructivism Constructs Confusion