Introduction : education technology's unrequited disruption -- I. Three genres of learning at scale -- Instructor-guided learning at scale : massive open online courses -- Algorithm-guided learning at scale : adaptive tutors and computer-assisted instruction -- Peer-guided learning at scale : networked learning communities -- Testing the genres of learning at scale : learning games -- II. Dilemmas in learning at scale -- The curse of the familiar -- The Edtech Matthew effect -- The trap of routine assessment -- The toxic power of data and experiments -- Conclusion : preparing for the next learning-at-scale hype circle.

"From MOOCs to autograders to computerized tutors, technologies designed for large-scale learning have never lived up to the hype. Justin Reich once promoted these "transformative" novelties; now he reveals their failures. Successful education reform, he concludes, will focus on incremental institutional change, not the next killer app"-- Provided by publisher.