„The development (rather than the history) of operations research as a science consists of the development of its methods, concepts, and techniques. Operations research is neither a method nor a technique; it is or is becoming a science and as such is defined by a combination of the phenomena it studies.“
— Russell L. Ackoff Scientist 1919 - 2009
p. 265, the lead paragraph ; Cited in: Joe Kelly (1969) Organizational behaviour. p. 26.