The document discusses the concept of "big ideas" in introductory courses and disciplinary contexts. It argues that introductory courses should focus on ensuring students understand core disciplinary concepts and ways of thinking, rather than just isolated facts. Assessing students' ability to apply these big ideas outside of class and reflect on their own thinking can help ensure deep learning. The document provides questions to help faculty design assignments and discussions that allow students to demonstrate their understanding and use of important disciplinary ideas.