The Stella II modeling Environment
The mathematical details of the numerical solution to the underlying model equations are accessible for those that want this detail. Additional control over the time step used and the numerical solution technique is provided for the user.
The Stella II environment makes it easy for introductory geoscience students to visualize the conceptual framework of a model, manipulate the model to explore its dynamic behavior, and with a little experience create their own models. At left the graph of population over time is shown with a slider/text box input control for BirthRate.
The latest version of Stella (2003) is Stella II (vs. 7.0.3) and is available from ISEE Systems: Why STELLA for Education? (more info) Stella II runs on the PC or Mac and is very reasonably priced via educational discount. Stella II save-disabled versions (Run-time version) allow one to run and experiment with pre-made models and are available for free to educational institutions.