Operations research '(OR) is the securing of improvement in social systems by means of scientific method - C. West Churchman

The idea of a ‘system approach’ is both quite popular and quite unpopular. It’s popular because it sounds good to say that the whole system is being considered, but it’s quite unpopular because it sounds either like a lot of nonsense or else downright dangerous – so much evil can be created under the guise of serving the whole.

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.

How can we design improvement in large systems without understanding the whole system, and if the answer is that we cannot, how is it possible to understand the whole system?