Good analysis from Michael Feldstein on 'the missing viola player' aspect of online learning: it's inability to comprehend and respond to student questions. I respond at more length to this article here how cMOOCs are interended to respond to this: "You don't need an expert for this - you just needs someone who knows the answer to the problem. So we have attempted to scale by connecting people with many other students. Instructors are still there, for the tough and difficult problems. But students can help each other out, and are expected to do so."
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