A Simplification of Forrester´s Model of an Urban Area

A greatly simplified version of Forrester´s model of an urban area is described. Whereas Forrester´s original model contained 20 states and 150 equations, the revised one contains 9 states and 81 equations. This revised model converges to a close approximation to Forrester´s equilibrium through similar temporal behavior and produces comparable results when Forrester´s 11 urban programs are applied.