“A social system consists in a plurality of individual actors interacting with each other in a situation which has at least a physical or environmental aspect, actors who are motivated in terms of a tendency to the "optimization of gratification" and whose relation to their situations, including each other, is defined and mediated in terms of a system of culturally structured and shared symbols.”
Source: The social system (1951), p. 5-6
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Talcott Parsons 17
American sociologist 1902–1979Related quotes

Cited in Donella Meadows (2008) Thinking in Systems: a Primer. p. 1.
1970s, The future of operational research is past, 1979
Source: "Social skill and institutional theory." 1997, p. 398
Source: The shaping of social organization (1987), p. 8; Cited in: Carola Aili, Pamela Denicolo, Lars-Erik Nilsson (2008) In Tension Between Organization and Profession. p. 228.

Source: Designing Social Systems in a Changing World (1996), p. 46; as cited in: Charles François (2004), International Encyclopedia of Systems and Cybernetics. p. 164
Source: Systems Engineering Tools, (1965), Systems Engineering Methods (1967), p. 70; First sentences of Ch. 3. Formulating and Structuring the System
In this text Harold Chestnut is here citing:
C. West Churchman, Russell L. Ackoff, and E. Leonard Arnoff (1957) Introduction to Operations Research. Wiley. New York, and
J. Morley English (1964) "Understanding the Engineering Design Process." The Journal of Industrial Engineering, Nov-Dec. 1964 Vol 15 (6). p. 291-296