“In concept a feedback system is a closed system. Its dynamic behavior arises within its internal structure. Any action which is essential to the behavior of the mode being investigated must be included inside the system boundary.”

—  Jay Wright Forrester

Source: Principles of Systems (1968), p. 4-1 as cited in: Richardson, George P. " Reflections on the foundations of system dynamics http://obssr.od.nih.gov/issh/2012/files/Richardson%202011.pdf." System Dynamics Review 27.3 (2011): 219-243.

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Jay Wright Forrester7
American operations researcher 1918–2016

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