The problem with edtech is they make the key mistake of taking the curriculum intended for pen / paper / chalkboard and they just put it on a tablet and expect it to work.
Seymour Papert wrote "Mindstorms" about this very topic in the 80s when PCs were being put in classrooms. Back then, teachers took the multiplication tables they had been doing with pen and paper and just made kids do them on the computer. Teachers make the same mistake with iPads and iPhones. Papert's book talks about the right way to do it -- reformulate the entire concept of learning to include these new tools. Unfortunately, everything gets measured against the old standards, and when the new tools don't work as well to teach the old standards as the tools with which the old standards were designed to be taught, obviously the results are going to look bad.
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