The document describes the 4E x 2 instructional model for moving from a traditional to a constructivist classroom. The model involves four stages - Engage, Explore, Explain, and Extend - repeated twice to reinforce concepts. During Engage, teachers actively involve students and connect to prior knowledge. Explore allows students to investigate ideas. Explain develops explanations with the teacher. Extend applies knowledge to authentic contexts. The document advocates for constructivist classrooms that involve collaborative, authentic learning through multiple representations and knowledge construction.