how to identify system
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THINK ABOUT THIS How to know whether you are looking at a system or just a bunch of stuff: A ) Can you identify parts? . . . and B) Do the parts affect each other? . . . and C) Do the parts together produce an effect that is different from the effect of each part on its own? . . . and perhaps D) Does the effect, the behavior over time, persist in a variety of circumstances?
Link:: Thinking in systems