Models from Celestial Mechanics vs Evolutionary Systems (1975)
All these mechanical models, like celestial mechanics, not evolutionary models, assum[e] constancy in the parameters of the system. ... This is why all these mechanical models whether Forresters' System_Dynamics or Jorgensen's Data Resources Inc model behave poorly when run backward. In evolutionary systems the parameters (constants) of the equations change constantly and unexpectedly.
"Growth, Sustainability, and Adaptation" TV talk Nov 11 75 for the Edison Electric Institute TV show.