Source: Advanced Systems Thinking, Engineering and Management (2003), p. 309; partly cited in: Kurt A. Richardson, Wendy J. Gregory, Gerald Midgley (2006) Systems Thinking and Complexity Science. p. 39
“Everyone knows what engineering is. All that's left is to define systems, and I'm not fool enough to do that.”
Source: Mathematicians are useful (1971), p. 1: Machol explains his definition of systems engineering.
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Robert E. Machol 24
American systems engineer 1917–1998Related quotes

“There's no system foolproof enough to defeat a sufficiently great fool.”
As quoted in "Nuclear Reactions", by Joel Davis in Omni (May 1988)
As quoted in Everything and More: A Compact History of Infinity (2013) by David Foster Wallace, p. 8
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Signatures.
The Art of Doing Science and Engineering: Learning to Learn (1991), p. 5

SGU, Podcast #253, May 19th, 2010 http://www.theskepticsguide.org/podcast/sgu/253
The Skeptics' Guide to the Universe, Podcast, 2010s