Expand the boundary of caring. - Donella Meadows

The world is a complex, interconnected, finite, ecological–social–psychological–economic system. We treat it as if it were not, as if it were divisible, separable, simple, and infinite. Our persistent, intractable global problems arise directly from this mismatch.

Models can easily become so complex that they are impenetrable, unexaminable, and virtually unalterable.

A delay in a balancing feedback loop makes the system likely to oscillate.