Some people can learn from books. Some need a teacher. The downside of teachers is that we are expensive and not very responsive at 2:00 in the morning or whenever you might most like to learn. Either way, however, reliable, professional teachers are needed to provide grading: to assure that the student has learned.
Uh oh!
Update: Sept '14
It is only one study, possibly biased (the article says little about method and I am too lazy to research further.) but MIT says that online courses teach as well as classrooms. Uh oh!
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