Managers are not confronted with problems that are independent of each other, but with dynamic situations that consist of complex systems of changing problems that interact with each other. I call such situations messes. Problems are extracted from messes by analysis. Managers do not solve problems, they manage messes.
Cited in Donella Meadows (2008) Thinking in Systems: a Primer. p. 1. - The future of operational research is past, 1979