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

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."

Every organization structure, even a poor one, can be charted, for a chart merely indicates how departments are tied together along the principal lines of authority. It is therefore somewhat surprising to find top managers occasionally taking pride in the fact that they do not have an organization chart or, if they do have one, feeling that the chart should be kept a secret.

The Mathematical School ; Although mathematical methods can be used by any school of management theory, and have been, I have chosen to group under a school those theorists who see management as a system of mathematical models and processes. Perhaps the most widely known group I arbitrarily so lump are the operations researchers or operations analysts, who have sometimes anointed themselves with the rather pretentious name of "management scientists." The abiding belief of this group is that, if management, or organization, or planning, or decision making is a logical process, it can be expressed in terms of mathematical symbols and relationships. The central approach of this school is the model, for it is through these devices that the problem is expressed in its basic relationships and in terms of selected goals or objectives.