An engineer friend of mine, after a decade in industry where he rose to management, decided to go get an MBA at a top ten management school. Compared to engineering, he said it was easy, since everything they teach you is obvious common sense.

I thought that meant the degree was worthless. But he said just the opposite. Even though it's all obvious common sense, it really helps to have someone lay it all out together and remind you to think about those obvious common sense things as you go about managing a business.