Jay Wright Forrester - Principles of systems (1968)

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Formulating a model of a system should start from the question Where is the boundary, that encompasses the smallest number of components, within which the dynamic behavior under study is generated?

Jay Wright Forrester

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

The principles governing the behavior of systems are not widely understood.

Jay Wright Forrester