The document discusses constructivism as a learning theory where students actively construct knowledge based on their experiences. It describes key theorists like Dewey, Piaget and Vygotsky and their views on how learning is an active process where students build on prior knowledge and social interactions. The document also contrasts traditional teacher-centered classrooms with constructivist student-centered approaches and discusses principles of constructivism like knowledge construction, social learning, and using student questions to drive instruction.