Although students of management would readily agree that there have been problems of management since the dawn of organized life, most would also agr… - Harold Koontz

The various schools of or approaches to management theory that I identified nearly two decades ago, and called "the management theory jungle," are reconsidered. What is found now are eleven distinct approaches, compared to the original six, implying that the "jungle" may be getting more dense and impenetrable. However, certain developments are occurring which indicate that we may be moving more than people think toward a unified and practical theory of management.

The Social System School: Closely related to the human behavior school and often confused or intertwined with it is one which might be labeled the social system school. This includes those researchers who look upon management as a social system, that is, a system of cultural interrelationships. Sometimes, as in the case of March and Simon, the system is limited to formal organizations, using the term "organization" as equivalent to enterprise, rather than the authority-activity concept used most often in management. In other cases, the approach is not to distinguish the formal organization, but rather to encompass any kind of system of human relationships.

The Human Behavior School: This approach to the analysis of management is based on the central thesis that, since managing involves getting things done with and through people, the study of management must be centered on interpersonal relations. Variously called the "human relations," "leadership," or "behavioral sciences" approach... This school concentrates on the "people" part of management and rests on the principle that, where people work together as groups in order to accomplish objectives, "people should understand people."