All you need to expand/better your business is to look out for opportunities/souces that already exist within your business - at the edge.

I find the idea very sensible - instead of looking for the new horizons, why not to look at the possibilities to better use the sources you already have? What if you can offer your customers more - by better understanding your capacities and their needs and plans?

The book is well in mapping the strategies already in practice, and can be a valuable source of eye-opening here.
Yet I would like more practical advice - the last chapter "Finding Your Edge" is quite short. I understand that the business needs to do their homework, yet more tips could help them more at that.