Constructivism is a theory of knowledge that assumes knowledge is constructed in the mind of the individual based on their experiences. Specifically, it is a theory of teaching and learning that says students learn new concepts in math through connecting them to previous knowledge structures. The theory has its roots in developmental psychology and was developed by thinkers like Piaget, Vygotsky, Bruner, and Dewey who were interested in how knowledge develops and grows in the mind of the individual. According to constructivism, the role of the teacher is to guide students and facilitate discovery, while the role of students is to actively participate in and take responsibility for their own learning.