This is certainly a must-read book for everyone that wants to understand the dynamics of disruptive and sustaining innovations.
Clayton Christensen brings essential conclusions from his study about the Hard Disk industry evolution. These conclusions help us on understanding why disruptive innovations represent such a big threat for established companies.
Why is it so difficult for big companies to disrupt their own products and markets if they have plenty access to money, knowledge and power? The answer is not so simple.