Constructivism is a theory of learning that argues that individuals create or construct their own new understandings based upon their previous knowledge and experiences. In a constructivist classroom, students are actively involved in solving problems and are encouraged to discover concepts for themselves. The teacher takes on the role of facilitator rather than lecturer, guiding students to build their own knowledge and form their own conclusions through projects, group work, and discussion. Assessment focuses on evaluating the learning process rather than just outcomes.