'OR' has been defined so far in various ways and it is perhaps still too yaung to be defined in some authoritative way. So it is importent and interesting to give below a few opinions about the definition of OR which has been changed according to development of the subject. -----
1. OR is a scientific method of providing executive with an analytical and objective basis for decisions. --- P.M.S. Blackett (1948)
2. OR is the art of giving bad answers to problems to which otherwise worse answers are given. ---- T.L. Saaty (1958)
3. OR is the application of scientific methods , techniques, and tools to problems involving the operations of systems so as to provide these in control of the operations with optimum solutions to the problem.
---- Churchman,Acorff,Arnoff (1957)
4. OR is a management activity pursued in two complementary ways --- one half by the free and bold exercise of commonsense untrammelled by any routine, and other half by the application of a repertoire of well established precreated methods and techniques .
--- Jagjit Singh (1958)
5. OR is the attack of modern methods on complex problems arising in the direction and management to large system of men, machines, materials, and money in industry, business and defence. The distinctive approach is to developed a scientific model of the system, incorporating measurements of factors such as chance and risk with which to predict and compare the outcomes of alternative decisions, strategies or controls. The purpose is to help management to determine its policy and actions scientifically.
--- Operations Research Quarterly (1971)
6. OR is a scientific approach to problem solving fo executive management.
--- H.M. Wagner
7. Operation research is the art of wining war without actually fighting it.
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