This paper at
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shows how a dynamic system is modeled as a Causal Loop Diagram where nodes represent system variables and connecting lines represent causal effects. The changing value of one variable can cause another to increase or decrease as described by equations. A time simulation of the model yields results presented with live charts, graphs and tables. This paper is illustrated with example models, time simulations and graphs from the WinA&D modeling tool for population growth, bank balance, demographics, production and water management.