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What's New in Version 9.1?
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 View Product Sheet
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Version 9.1 feature additions make it even easier to build, share, and learn from
STELLA and iThink models.
Export for isee NetSim™
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"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."
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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.
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Click
to enlarge screenshot
Modules
provide an easy way to map out
the dynamic hypothesis for your model
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"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.."
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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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Click
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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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