During 30 years as a systems analyst and teacher, this author has been constructing models to understand and convey key principles related to the long-term causes and consequences of physical growth on the planet. In this article, he describes two different models that he has developed to accomplish these goals. One was employed as a computer simulation; the other functioned as an operational game. In comparing them, the author points out many differences between the two tools and indicates two important challenges for this profession.
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