The Theory of Constraints is based on some principles, on logical tools, on simple operational processes and on a series of applications in different fields. We think about the management of Human Resources, Purchasing, Production, Marketing, Sales etc … The first two principles are inspired by the words of Isaac Newton: “nature is absolutely simple and consistent with itself”, while the tools of thought derive from the methods of maieutics and that is the art of leading the interlocutor to reach the clear awareness of the truth (through questions)…