Reading Supporting Material

Supporting Material files are found on the Conference Proceedings page in the Papers, Workshops or Other Presentations and Events index. All presentations and events are listed alphabetically by the last name of the primary author, chair or presenter.

Viewing/Opening/Reading the Supporting Material:

Supporting materials will contain either a single file, or a PKZip® format file which can be opened with any number of utilities or directly on some operating systems. Supporting materials may include plain text files or other commonly used file types. In addition, models may be included and these will have file extensions that depend on the software used to create them. Below, find information on how to access freeware/demo/trial versions for regularly used software from several system dynamics software publishers. Follow the links within the descriptions below to the software needed to view the files.
In the following chart, find the three-letter extension of the file name, then the software you need to view the file.

File Name Extension:

.itm, .stm



.vmf, .vpa, .vpm, .mdl

Software Needed:

iThink, STELLA

Powersim Studio



STELLA/iThink by isee systems --
This link will navigate you to the FREE isee Player. The isee Player lets you view, run, print and share both STELLA and iThink models. Available in both Windows and Macintosh versions, the isee Player allows exploration of all model layers - map, model, equation, and interface, and never “times out.”

POWERSIM SOLUTIONS offers Powersim Studio by Powersim Software:
New features of Studio 9: muli-core support, 64 & 32 bit versions, and presentation sidekick that can use HTML content. ***A new, FREE Studio 9 Express for STUDENTS, TEACHERS, & others to build and test small models, along with fully-functional 30-day trial version of Powersim Studio 9 Enterprise edition are available for download.

VENSIM by Ventana Systems:
The Vensim Model Reader can be used to open Vensim model files with extension .vpm or .vpa. This is free software which will allow you to view and simulate models, changing the parameters but not model structure. Many models (.vmf, .vpm, and .mdl) can also be opened using Vensim PLE which is free for educational use. Both PLE and the Reader are available from: and

September 15, 2012