The 5 E's model is an instructional model developed in 1987 by the Biological Science Curriculum Study to provide a framework for lesson planning. The 5 E's stand for Engage, Explore, Explain, Elaborate, and Evaluate. According to the model, lessons should engage students, allow them to explore concepts hands-on, explain their understanding, elaborate on their knowledge, and evaluate what was learned. One advantage is that students construct their own understanding before formal instruction, rather than passively receiving information from the teacher.