Models can easily become so complex that they are impenetrable, unexaminable, and virtually unalterable.
Meadows (1980) "The unavoidable a priori" in: Randers J. ed., Elements of the system dynamics method. p.27
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.Donella Meadows
Calculating how much carbon is absorbed by which forests and farms is a tricky task, especially when politicians do it.Donella Meadows
A system is a set of things people, cells, molecules, or whatever interconnected in such a way that they produce their own pattern of behavior over time... The system, to a large extent, causes its own behavior.Donella Meadows
Mesarovic and Pestel are critical of the Forrester-Meadows world view, which is that of a homogeneous system with a fully predetermined evolution in time once the initial conditions are specified.Donella Meadows
When asked if we have enough time to prevent catastrophe, she'd always say that we have exactly enough time starting now.Donella Meadows