the world leader in systems thinking software
 
"Systems Thinking software like STELLA and iThink is an increasingly valuable tool for constructing understanding about all kinds of dynamic systems from natural environments to team dynamics to economic markets."
Peter Senge,
Author of The Fifth Discipline
Founding Chairperson, SoL
Education and Research
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Business
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STELLA Environmental Bundle Diana Fisher

Save on our NEW specially priced STELLA and iThink Bundles

Publish models on the web with isee NetSim. Version 1.1 now supports graphical input devices and more!

We're celebrating Diana Fisher's Lifetime Achievement Award. Save 20% on ALL 
K-12 products
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The new Version 9.1.4 isee Player lets you view and share iThink and STELLA models for FREE.
(updated 5/04/2010)
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