This one? http://businessofsoftware.org/2012/02/professor-clayton-christensen-at-business-of-software-2011-the-job-your-product-does/ http://businessofsoftware.

This one? http://businessofsoftware.org/2012/02/professor-clayton-christensen-at-business-of-software-2011-the-job-your-product-does/ http://businessofsoftware.org/2012/02/professor-clayton-chri... I can also recommend the HBR article mentioned above.