Phil Hill quite right explains the objection to using the term "disruptive" to apply to education innovation: "judging a non-commodity public good with the same theory as disk drives is a silly notion without some extensive analysis to back up that extrapolation." But now, he writes, there's even more evidence showing the concept of 'disruptive innovation' is not particularly useful. There are four key elements in the theory (see the image), and yet only 9 percent of the cases actually cited fit all four elements. "It seems that the case studies were cherry picked to highlight one element at a time, but the cohesive theory of disruptive innovation might not be backed up even by its own data."
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