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What's New in Version 9.1? |
 View Product Sheet |
Version 9.1 feature additions make it even easier to build, share, and learn from STELLA and iThink models.
Export for isee NetSim™ |
| "Version 9.1 allows us to represent complex models by creating a hierarchy of one-page maps. This is a great innovation that will define the architecture of future complex models." |
Khalid Saeed, PhD
Professor of Economics and
System Dynamics
Worcester Polytechnic Institute |
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Models are easily exported and published to the web using the newly released isee NetSim software. Simulations can be shared with anyone with a browser, whether or not they are iThink or STELLA users. Models can be published to a free Forio Broadcast account hosted by isee’s partner, Forio Business Simulations, or any other server where isee NetSim Server software is installed. |
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| Hierarchical modules
Hierarchical modules simplify models of large, complex systems. Small, self-contained portions of a model can be linked together in a hierarchical system. Hierarchical modules can also serve as reusable model templates or “building blocks” of generic structures. Using modules to break large models into small, well-defined pieces assists in testing and accommodates size limitations. |
Click to enlarge screenshot 
Modules provide an easy way to map out
the dynamic hypothesis for your model |
"The modules feature in version 9.1 makes it easier to construct and communicate a model by chunking down the complexity into manageable pieces, without losing sight of the whole picture.
I can also develop a model library and focus more on putting core module structures together rather than individual stocks and flows.." |
David Rees
Synergia |
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Polarity
Polarity capabilities allow modelers to easily display cause and affect relationships between variables. Polarity is assigned to a Flow or Connector by right-clicking on the entity, and choosing “+/s” or “-/o.” Connections between model elements will reflect a positive or negative relationship using symbols that are set through Model Preferences. |
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Assigning polarity makes it easy to share the feedback loops in your model |
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| Expanded data import and export functionality
Data can be imported from multiple Excel worksheets. A new “Use table settings” exports data exactly as it appears in the table rather than exporting the values of model variables at the end of a simulation run or time interval. |
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| Page size options
New options in the Interface Preferences dialog make it easier to create Runtime models and those you want to publish to the web. Simply set the size of the display window and assign a Home Page. When pages are shown on the Interface Layer, they will respect the sizing that was set. |
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| New button options
Navigation buttons support Next Page, Previous Page, and Home Page navigation. Optional use of button titles and format titles for Transparent Buttons makes it easy to add navigation or hyperlinks to your model. |
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| New built-in functions
ARCSIN, ARCCOS and NormalCDF have been added to the list of available built-in functions. |
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| Causal Loop Diagram mapping
New "Name Only Modules" option in the Model Preferences dialog allows for creation of Causal Loop Diagrams to map out high level causal relationships. |
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| Expanded Ghost tool functionality
Connect variables across modules and automatically assign module inputs and outputs with the Ghost tool. |
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| Additional tutorials
Model Building & Simulation and Interface Creation tutorials provide step-by-step instruction by demonstrating the software mechanics and features used to build a simple model of a population constrained by natural resources. |
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