The courses offered through edx will incorporate video lessons, online quizzes, and real-time feedback. Students will receive a certificates of mastery for their efforts. In recent years, there has been a massive groundswell in online learning—enabled by high-speed Internet connections, ubiquitous computers, and back-end technology like cloud computing. Edx is just the latest—and most prestigious—endorsement of that phenomenon.
Read more: http://www.technologyreview.com/view/427814/harvard-and-mit-offer-online-education-for-free/