During the early stages of an industry, when the functionality and reliability of a product isn't yet adequate to meet customer's needs, a proprietary solution is almost always the right solution - because it allows you to knit all the pieces together in an optimized way.

A great book seeks to explain causality, not correlation. It works to point out the circumstances in which it works, and where it doesn't. And in so doing, it is broadly applicable.

The process of writing 'The Innovator's Dilemma' entailed the developing a new theory. My colleagues, students and I have been improving that theory, and adding others to it, since that time.

Clayton M. Christensen Quotes