This paper seeks answers to a question implicit in the theme of The 28 th International System Dynamics Conference Program: "how can humankind move "Beyond the Crisis" towards political economies that are more resilient, sustainable and humane?" Its focus is cities, which are seen both as the principal loci of the crisis and pointing paths to moving behind it. Those concerned with urban
... [Show full abstract] challenges need new ways of viewing the problems they face. In seeking new ways, they should consider what Dr. Louis Alfeld has called "perhaps the most insightful System Dynamics application ever developed": Jay Forrester's urban dynamics model. This representation of cities as living systems seeking equilibrium with their environments offers lessons that are timeless and needed. A notable development success story, Singapore illustrates applications of these lessons by leaders who were not even familiar with Forrester's work. This further highlights the value and contemporary relevance of the worldview of the urban dynamics model.