Thanks for the comments. Very helpful. Again, to reiterate, I actually like Khan Academy, and the post wasn't critiquing Khan as much as it was our turning Khan into something that it's not. The post wasn't about Khan. It was about us.
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Schools are experimenting with using it as a core instructional tool. That is not in question. Whether or not Khan himself is advocating this is besides the point (although they are involved in pilot programs). The point is that schools & districts are turning to a style of instruction that we know from research does not work, and that threatens to postpone the more important -- and necessary -- conversation about better teaching and better curriculum.
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That said, I have heard what Khan has said about how he envisions Khan Academy being used. (Awkward sentence; apologies). He wants teachers to be able to offload skills instruction in order to be freed up to pursue projects and other applications. In theory, this is terrific. As a former classroom teacher myself, I know how much time we spend on basic skills. However, my concern -- and let's be clear; I say this as a teacher -- is that if students aren't learning the skills correctly in the first place, then they won't be able to apply them.
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Finally, as someone who has spent considerable time -- and all of his savings -- trying to create a product that will help teachers teach better from the curriculum angle, I can tell you that Khan Academy has made it incredibly difficult to fund new projects in the ed space. Yes, there is more money than ever, but almost all of it is for platforms. Nobody wants to put money into effective content, because the media narrative has convinced them that the math problem has already been "solved." Having watched many, many Khan Academy videos, and having spoken to any number of teachers and school administrators, I have a difficult time believing this to be true.
Again, at its core, the blog post was about how Khan Academy was originally intended as a source for homework help; that we've begun to use it for much more than this; and that this risks perpetuating the underlying problem.
This seems fairly straightforward, uncontroversial, and I must admit that I'm surprised by how energetic (and in some cases, vitriolic) the response has been.