To help one section of his Yale students absorb the calculus concepts in Math 115, Jim Rolf used the Coursera platform during the fall 2014 semester to deliver online video tutorials that the students were required to watch before attending classes. He also used the platform to have his students complete quizzes on the material before they came to class so that he could assess what topics had proven difficult for them to grasp; he then organized his classroom time to focus on those problems.