MIT has a local instance of the Open edX platform on-campus classes. 99% of current MIT undergraduates have taken a class in which they used this Open edX platform. Faculty are using it in many different ways to improve the effectiveness & efficiency of their instruction for better student learning. The Open edX platform provides rich online assessments with rapid feedback, adaptive hinting, videos with interspersed concept questions, and a range of other methods to activate student learning. Faculty are also leveraging the rich data that the platform provides to gauge student understanding in real time.