The various schools of or approaches to management theory that I identified nearly two decades ago, and called "the management theory jungle," are re… - Harold Koontz

Organization charts are subject to important limitations. A chart shows only formal authority relationships and omits the many significant informal and informational relationships.

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 Decision Theory School : Another approach to management theory, undertaken by a growing and scholarly group, might be referred to as the decision theory school. This group concentrates on rational approach to decision-the selection from among possible alternatives of a course of action or of an idea. The approach of this school may be to deal with the decision itself, or to the persons or organizational group making the decision, or to an analysis of the decision process. Some limit themselves fairly much to the economic rationale of the decision, while others regard anything which happens in an enterprise the subject of their analysis, and still others expand decision theory to cover the psychological and sociological aspect and environment of decisions and decision-makers.