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great article on the Khan academy with sidebars to other e-learning as well

Teachers have long known that one-on-one tutoring is effective, but in 1984, the education scholar Benjamin Bloom figured out precisely how effective it is. He conducted a metastudy of research on students who'd been pulled out of class and given individual instruction. What Bloom found is that students given one-on-one attention reliably perform two standard deviations better than their peers who stay in a regular classroom. How much of an improvement is that? Enough that a student in the middle of the pack will vault into the 98th percentile. Bloom's findings caused a stir in education, but ultimately they didn't significantly change the basic structure of the classroom. One-on-one instruction, after all, is insanely expensive. What country can afford one teacher per student?