Disruptive innovations are like missiles launched at your business. For 20 years we’ve described missile after missile that took aim and annihilated its target: Napster, Amazon, and the Apple Store devastated Tower Records and Musicland; tiny, underpowered personal computers grew to replace minicomputers and mainframes; digital photography made film practically obsolete.

A version of this article appeared in the December 2012 issue of Harvard Business Review.