How can data enhance instruction? Harvard physics professor Eric Mazur, feeling he had reached a limitation with lecture-style teaching, sought to foster greater knowledge assimilation in students through a tool he developed called Learning Catalytics. When students respond to classroom questions, using laptops or mobile phones, Learning Catalytics tracks their answers – and then provides helpful results, such as suggesting ideal pairings for subsequent discussion groups. The tool also uses student analytics to help instructors hone future questions.