A lot of people, even those trained in the field, think that innovation is just one set of practices.  That's not the case.  How you do innovation depends on the kind of challenge you face.  And as a result, over the last 70 years, three very different methodologies have been widely adopted.  Today a fourth approach, Ecosystem Innovation, is emerging in response to the need to tackle complex and fast moving challenges in business and the world around us.