StarLogoT is a programmable modeling environment for building and exploring multi-level systems. It is one of a class of new "object-based parallel modeling languages" (OBPML). StarLogoT allows you to control the behavior of thousands of objects in parallel. Each object has its own variables and state. This allows one to model the behavior of distributed and probabilistic systems, often systems that exhibit complex dynamics.

StarLogoT was developed at the Tufts University Center for Connected Learning and Computer-Based Modeling which has since relocated to Northwestern University . It is an extended version (a superset) of StarLogo 2.0.4, which was developed by the Epistemology and Learning Group at the MIT Media Laboratory.

Our most recent version is StarLogoT2002. StarLogoT is only available for the Macintosh. It is free of charge. Sample projects and complete documentation are included in the package.

A cross-platform successor to StarLogoT is also available from CCL. The new software, called NetLogo, runs on Windows, MacOS, Linux, and other machines. NetLogo includes most StarLogoT features. StarLogoT models can be converted to NetLogo through the use of a converter and some "hand changes". NetLogo is available here.

• MacOS computer with a PowerPC processor.
• Apple Guide system software extension.
• At least 15 megabytes of available RAM.

• OS X compatibility (in "classic" mode)
• "find" and "find/replace" dialog for text windows
• New and improved settings dialog
• Improved documentation
• Laundry-list of other features and bug fixes.

If you have trouble downloading: StarLogoT comes as a large file (about 6 MB), and as with any internet file transfer your download may be interrupted due to network difficulties, server overload, etc. If you have repeated difficulties downloading the program please send us mail. Indicate the nature of your problem, and we will do our best to respond promptly.