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Software FAQs

Will the Windows version of Stella or iThink run Macintosh models and vice-versa?

If you are using a Windows computer, you can open and run models that were saved on a Macintosh. The same is true on the Macintosh when opening a model saved on Windows. You do not need to convert the models.

What are the system requirements for Stella and iThink?

iThink and STELLA are available in both Windows and Macintosh versions. Windows Vista or later and Macintosh OS 10.10 or higher are required.

Do Stella and iThink run on a 64-bit Windows operating system?

Yes, both Stella and iThink run natively on 64-bit Windows machines.

How do I bend a flow?

Drop a flow and start dragging it. When you want it to change direction at a 90-degree angle, hold down the shift key while you move the cursor in the direction you want the flow to go. For more tips and tricks about using Stella, read our blog post.

How do I add another bend to a connector?

Drop a connector into the first variable and start dragging it. When you want it to add a bend, hold down the shift key while you move the cursor in the direction you want the connector to go.

How do I delete a page on a Graph or Table Pad?

To delete a page on a Graph or Table Pad, click the page-turn arrows in the top right corner of the Graph or Table Pad until the page that you want to delete is showing. Next, click on the red minus sign in the top left corner of the Graph or Table settings panel.

Can I change the default color for my model entities?

Yes, you can change the default color of entities for each model that you build that will apply to all models you build after making the setting. The option is available in the “Default Settings…”, accessible from the Edit menu.

Why will a Module run by itself using "Run Selected Modules" but won't run in a higher level of the model hierarchy?

If you have Connectors into a Module that are not being used or there are inputs inside the Module that have not been assigned, the Module will not run in a higher level of the model hierarchy.

Why do I sometimes get a "File not Found" message when opening a model?

It may be a missing picture, Excel spreadsheet, or some other imported file. When copying a model from one computer to another, you may need to copy more than just the model file. If your model uses other files such as graphics, sounds, or spreadsheets you’ll need to package all of them with the model file. For more details, read our Blog Post.

Can I run a Stella or iThink model from a Windows or Macintosh command line?

Yes, you can open and run models from a command line. You can also perform other operations using the command line. For more details, read our Blog Post.

Do Stella and iThink support matrix arithmetic?

Yes, Stella and iThink support matrix operations such as addition, subtraction, transposition, multiplication, and division. You can also perform matrix multiplication with the PROD builtin function. For more details, read our Blog Post.

Can I create causal loop diagrams (CLDs) in Stella and iThink?

Yes, you can build causal loop diagrams using either name-only modules or name-only delay converters. Using modules, you can also link a CLD to a working stock and flow model. To learn more and see an example, read our Blog Post.

Why is storytelling (Stella Architect/Stella Designer) such a powerful feature?

Storytelling is a feature unique to Stella Designer and Architect that allows you to present and explain your model piece-by-piece. Even more powerful, however, is the ability to show the behavior as the structure of the model unfurls. Through storytelling, you can clearly create and communicate the link between the structure of the system and the dynamic behavior. For more details, read our Blog Post.

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