Why have so many tiny start-ups come from nowhere to take down huge established corporations? Is it because the incumbents were dumb? Harvard Business School professor Clayton M Christensen decided to explore these David versus Goliath battles - and came up with a theory to explain why seemingly solid businesses suddenly lose market share... disruptive innovation.  

In his hit book, The Innovator's Dilemma, Christensen explored how flawed products from small companies can suddenly catch on, disrupt the market and steal customers from established corporations. Christensen - a life-long Boy Scout - was an odd champion for "disruptive innovation", but his ideas have totally changed the business landscape.

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