Just to share some of the things I've learned during our group discussion:
A hedgehog concept is not a goal to be the best, a strategy to be the best, an intention to be the best, a plan to be the best. It is an understanding of what you can be the best at.
Doing what you are good at will only make you good. Focusing solely on what you can potentially do better than any other organization is the only path to greatness.
And a hedgehog concept is the intersection of three ideas - What you are passionate about, What you can be best in the world at, and What drives your economic engine.
I found this quote by D.L. Moody which I think best describes the Hedgehog concept, he said,
"Give me a man who says ‘This one thing I do,’ not ‘These fifty I dabble in.' "
Basically it teaches us to know what is the one thing that we are passionate about, for we know that is where we can be the best in the world at. Doing everything that will continue to drive our passion to it. And eventually realize we already hit our goals, by just doing what we loved to do.