Good to Great By James Collins aka Jim Collins

Good to Great: Why Some Companies Make the Leap... and Others Don't is a management book by James C. Collins that aims to describe how companies transition from being average companies to great companies and how companies can fail to make the transition. "Greatness" is defined as financial performance several multiples better than the market average over a sustained period of time. Collins finds the main factor for achieving the transition to be a narrow focusing of the company’s resources on their field of competence.