Actually, Khan Academy is outperforming face-to-face remedial math only. What KA is doing and Coursera isn't, is diagnosing student progress and misunderstandi

Actually, Khan Academy is outperforming face-to-face remedial math only. What KA is doing and Coursera isn't, is diagnosing student progress and misunderstandings by utilizing a tree of knowledge. KA is actually testing students and pointing to where they should go next. It's trivial to test for example foreign word spelling in software: Just ask the student to type a word and see if it's right. Peter Norvig recently talked about using Udacity's massive data on students to predict what misunderstandings students have about programming, much like a face-to-face teacher might do.