Aesthetics, Ethics, Science, and Production.
Marc Pierson: "I came across Russell Ackoff's statement that Beauty, Good, Truth, and Economy are necessary and sufficient for any Social System." ⇒ "1, 2, 3, and 4 are necessary and sufficient for any (minimum) System." ⇒ Fourth Point ⇒ Viewpoint.
~
Russell Ackoff's talk presented at the Systems Thinking in Action conference - November 1993.