There are two kinds of worlds: one inside and the other outside each individual. Individuals have to manage both worlds. It is put forward for consideration that the management of the world inside is a precondition for an effective management of the world outside oneself, namely the management of the money, man, material, machine, marketing, etc. The study of the world inside an individual constitutes the subject matter of self-management. An individual is a living organism. The organism is self-contained, self-regulated, and self-sustained. The management of a self-regulated order appears to be unnecessary. But every individual is endowed with the power to choose freely and make one's own decisions. The use of the power of conscious thought by individuals may or may not disturb the self-regulated order of the living organism.