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Author: Tom Fiddaman

Ventity 5.1 Release

Ventity 5.1 adds new features including Run Lists, Style Overrides, and options to hide run-time warnings.  This version also supports the use of entities created during the simulation by sensitivity and optimization parameters.  See the help for more details.

What’s New @ ISDC 2024

Video from the Ventana Systems vendor demo/user group session at the 2024 System Dynamics conference in Bergen. See also: the new workshop video.

Ventity 4.9 Release

Ventity 4.9.1 is now available from the download page (if you need a trial license) or the update page (if you don’t). 4.9.1 is a minor maintenance release that improves trapping and messages for generated code errors, fixes a file format issue with the 3D visualizer, and corrects a rare action issue. 4.9 is a major release, with many improvements. Per […]

What’s New 2022?

News on Vensim and Ventity from our User Group/Demo session at the 2022 System Dynamics Conference:

Ventity 4.8 Release

Release 4.8 is primarily an under-the-hood upgrade, with enhanced performance and functionality supporting use of large models in embedded systems. Contact us if this application is of interest. There are also bug fixes and minor usability improvements, including: Digital signing in the installer has been improved, which resolves issues with failure of the application to start up.

Ventity 4.7 Release

This build contains a variety of improvements to interface and simulation engine components. New features include: One major feature, not visible to most users, is enhanced support for the Windows Service and embedded uses of Ventity. Contact Ventana for details. There are many minor improvements and bug fixes.

Ventity 4.6 Beta

The Ventity 4.6 beta is primarily an under-the-hood performance enhancement, with a few bug fixes and feature improvements as well. The primary feature enhancements are to Process List actions, making it easier to restrict the number of iterations, and much faster to make small randomized selections from large entity collections. This version is stable in use, but […]

Ventity 4.5 Release

Ventity 4.5 is now available for download or upgrade. There are some further performance improvements over 4.4, as well as a few critical bug fixes to the Initial() and DelayInformation() functions. A number of minor bugs have been fixed as well, including the occasional tendency of autocomplete to delete left parentheses when adding variables to an expression. Overall […]

Doing Classic SD in Ventity

Ventity extends the System Dynamics paradigm with a number of features that enable dynamic cohorts, agents, networks and other hybrid simulation features. However, Ventity is pretty great for simple, aggregate dynamic models, too. You don’t need to know about its advanced features to put the entity architecture to good use by automating suites of policy […]

Ventity 4.4 release

This is a full version 4 release. There are no major new features beyond the many introduced in the v4 beta. The emphasis is on speed and memory improvements in the simulation engine. Diagram tool behavior is a little more Vensim-like, with fewer clicks required to accomplish some tasks, and the toolbar now includes a pointer […]

Ventity 4 beta release

This is a preliminary version 4 release. In addition, there are many minor usability enhancements and bug fixes.

Vensim 8.1 Release

Vensim 8.1 is now available for download. See you at the System Dynamics Conference to talk about it!

Community Coronavirus Model

This video explores a simple epidemic model, parameterized for a community confronting coronavirus. The video is in Vensim, but we’ve now translated the model to Ventity: Community corona 8.zip There’s another copy at metasd.com, where you can share comments. Also, check back here for updates to the model and a companion video, to be released soon.

Coronavirus & Epidemic Modeling

Community Coronavirus Model This video explores a simple epidemic model, parameterized for a community confronting coronavirus. You can run the model using Vensim PLE or the Model Reader (or any higher version). Our getting started and running models videos provide a quick introduction to the software. There’s now an update: community corona 8-mdl+vpmx.zip (vpmx and mdl formats) We’ve also translated it to Ventity, which […]

Ventity 3.0.2 Released

This is a minor maintenance release. See the Release Notes for details. Download a new copy, or update your existing software.

Ventity 3.0.1 Released

This is a minor maintenance release, but it brings substantial improvements to the beta GIS visualizer. See the Help System for details.

Ventity 3.0 Released

We’re pleased to announce the release of Ventity 3.0. There are many small improvements, plus two big new features: user-defined custom macros: and a visualizer for geospatial data: Check it out!

Translating Vensim models to Ventity

This video covers Ventity’s features for importing Vensim models.0:00 – a quick overview of the import feature and how we think about it1:37 – importing a simple model of stock management18:05 – importing a more complex, subscripted competitive market model

Ventity 2.0.1 Released

We’ve been hard at work on the Ventity 2.0.1 release and wanted to highlight some of the new and improved features – it’s actually a significant upgrade – more of a “2.1” than the version number indicates. We’ve rebuilt the autocomplete text prompts in stocks, flows, auxiliaries and actions to list the variables linked on […]