Coursera describes itself as a "social entrepreneurship company that partners with the top universities in the world to offer courses online for anyone to take, for free". Among the institutions offering courses are Stanford, the University of Pennsylvania, University of California, Berkeley and the University of Toronto. More recently the University of California, San Francisco, Edinburgh University and the Swiss Federal Institute of Technology of Lausanne have joined up to contribute to a list of 116 courses across sixteen categories including computer science, biology, education, literature, medicine, economics, mathematics and other disciplines. None of the classes counts as credit towards degrees at the participating institutions but students do receive certificates for completing their studies. The site includes a pedagogy page which explains the pedagogical foundations on which the platform is built, detailing its extensive use of interactive exercises, quizzes and ‘mastery learning’.