„One cannot help but be struck by the diversity that characterizes efforts to study the management process. If it is true that psychologists like to study personality traits in terms of a person's reactions to objects and events, they could not choose a better stimulus than management science. Some feel it is a technique, some feel it is a branch of mathematics, or of mathematical economics, or of the "behavioral sciences," or of consultation services, or just so much nonsense. Some feel it is for management (vs. labor), some feel it ought to be for the good of mankind — or for the good of underpaid professors.
But this diversity of attitude, which is really characteristic of all fields of endeavor, is matched by another and more serious kind of diversity. In the management sciences, we have become used to talking about game theory, inventory theory, waiting line theory. What we mean by "theory" in this context is that if certain assumptions are valid, then such-and-such conclusions follow. Thus inventory theory is not a set of statements that predict how inventories will behave, or even how they should behave in actual situations, but is rather a deductive system which becomes useful if the assumptions happen to hold. The diversity of attitude on this point is reflected in two opposing points of view: that the important problems of management science are theoretical, and that the important problems are factual.“

—  Charles West Churchman, 1940s - 1950s, "Management Science — Fact or Theory?" 1956, quote in: Fremont A. Shull (ed.), Selected readings in management https://archive.org/stream/selectedreadings00shul#page/n13/mode/2up, , 1957. p. 7-8
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„The Current Approaches to Management Theory and Science
I hope the reader will realize that, in outlining the eleven approaches, I must necessarily be terse.“

—  Harold Koontz 1909 - 1984
"The Management Theory Jungle Revisited," 1980, The empirical or case approach : The members of this school study management by analyzing experience, usually through cases... The interpersonal behavior approach: This approach is apparently based on the thesis that managing involves getting things done through people, and that therefore the study of management should be centered on interpersonal relations... The group behavior approach : This approach is ... primarily with behavior of people in groups rather than with interpersonal behavior... The cooperative social system approach : A modification of the interpersonal and group behavior approaches has been the focus of some behavioral scientists on the study of human relationships as cooperative social systems... The sociotechnical systems approach : One of the newer schools of management identifies itself as the sociotechnical systems approach... The decision theory approach : This approach to management theory and science has apparently been based on the belief that, because it is a major task of managers to make decisions, we should concentrate on decision making... The systems approach ; ... the systems approach to the study and analysis of management thought... The mathematical or "management science" approach : There are some theorists who see managing as primarily an exercise in mathematical processes, concepts, symbols, and models... The contingency or situational approach : ... the contingency approach to management. The managerial roles approach :... popularized by Henry Mintzberg [1973, 1975]... The operational approach : The operational approach to management theory and science, a term borrowed from the work of P. W. Bridgman [1938, pp. 2-32], attempts to draw together the pertinent knowledge of management by relating it to the functions of managers... The nature of the operational approach can perhaps best be appreciated by reference to Figure 1. As this diagram shows, the operational management school of thought includes a central core of science and theory unique to management plus knowledge eclectically drawn from various other schools and approaches... p. 177-182

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„In science we must all submit not to what seems to us attractive from one point of view or another, but to what represents an agreement between theory and experiment.“

—  Dmitri Mendeleev Russian chemist and inventor 1834 - 1907
Faraday Lecture, the Royal Institution, London (1889) as quoted by Leon Gray, The Basics of the Periodic Table (2013)

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„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“