Scaling Lean has been a great addition to my business library because it actually includes some useful calculations and math that you can use to test your business idea, instead of just theory and case studies. This math alone has made the purchase of the book worthwhile for my business.

This is also not the type of business book that you are going to read through quickly and then set aside. You are going to revisit this book over and over again to help you put the ideas in the book into action. Even on my first read through my book is filled with post it notes and dog-eared pages for the sections I know I am going to need to come back to again and again.

If you are not a big fan of doing math, don't be scared away from the book, the calculations are not difficult, and will give you some real insight into the path you can take building your business.

I run a small business on my own from my basement, and although the concepts are adaptable to my business, it takes a bit of work to make the numbers make sense at my much smaller scale compared to other businesses. The concepts in the book still work, just realize you will need to do some work on your own to adapt the math and concepts to your business if you are a smaller business like I am.

The only thing that puts me in the "four star" and not "five star" category is that I haven't had a chance to take action on the concepts in the book yet (I only just received it and read it) and I don't think it would be right to give a five star rating until I have battle-tested the concepts fully in my business.