Learning Catalytics is an interactive classroom tool that lets you use your smartphone, tablet, or laptop to participate in and stay engaged in lecture. Simply log in and respond to the open-ended questions your instructor posts during class. Your professor can use the results of these questions to help address misunderstandings, start small group discussions, or decide that you're ready to move on to a new idea. You can also use Learning Catalytics to anonymously let your professor know that you didn't understand something.