JIM COLLINS, Good to Great

“Greatness comes about by a series of good decisions consistent with a simple coherent concept – a ‘hedgehog concept.’ The hedgehog concept is an operating model that reflects understanding of the three intersecting circles:

What you can be the best in the world at;
What you are deeply passionate about;
What best drives your economic or resource engine.
“There is no single defining action, no grand program, no one killer innovation, no solitary lucky break, no miracle moment. Rather the process resembles relentlessly pushing a giant heavy fly wheel to turn upon turn building a momentum until a point of breakthrough and beyond.”