[caption id="attachment_27459" align="alignleft" width="200" caption="Disruptive innovations are based on the idea that every so often, a new innovation comes along that completely changes the marketplace."]Disruptive innovations are based on the idea that every so often, a new innovation comes along that completely changes the marketplace.[/caption]

If Harvard Business School's Clayton Christensen is right, half of all instruction will take place online within the next 10 years--and schools had better get into the online-learning market or risk losing their students to other providers.

Christensen was at the American Association of School Administrators conference in San...

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