• Ventity 5.2
• MIT SD Alumni Group
• Tariff Simulation Event

Ventity 5.2 Release

Ventity 5.2 has just been released. You can download a copy with a 60-day evaluation license, or update your existing copy.

5.2 is primarily a performance upgrade, with parallel execution of sensitivity runs and improved savelists for managing sensitivity output. There are also some nice usability improvements, like duplication of Actions, as well as a number of bug fixes.

See the Release Notes for details.

If you missed 5.1, there are more cool new features like Model Maps:

If you’re new to Ventity:

The Help system contains a lot of good “getting started” material, including a series of videos, which are also on Vimeo, starting with
https://vimeo.com/134983029
Also look for our workshop at ISDC 2025.

The Ventity support forum is up and running at
https://www.ventanasystems.co.uk/forum/viewforum.php?f=48

Ventity licensing is now perpetual, and lapsed licenses through 4.9 will continue to work with this version. If you have Vensim Pro or DSS with current maintenance, you already have a Ventity license. If you don’t have your key, email us at [email protected] for a copy.

Welcome MIT System Dynamics Alumni

The MIT Alumni System Dynamics Group is a vibrant community committed to advancing the field of System Dynamics—a discipline pioneered at MIT by Jay W. Forrester—through interdisciplinary collaboration, experiential learning, and real-world application. The group brings together alumni, students, affiliates, and professionals to tackle complex challenges across various sectors, including healthcare, sustainability, technology, and policy.

Through events like simulations, workshops, and networking sessions, members engage in action learning to deepen their understanding of dynamic systems and their impact. The group’s mission emphasizes amplifying knowledge synergies, increasing awareness of systems thinking, and fostering inclusive opportunities for innovation and problem-solving within the global MIT ecosystem.

All are welcome – including MIT alumni, students, faculty, the MIT community, friends of MIT, and anyone who wishes to join, learn, and meet others.

Tariff Impacts and Levers

The MIT Alumni SD Group’s next event, June 25th virtually, will apply the System Dynamics lens to tariff turbulence.

Tariffs are part of a control system that regulates the flow of goods across borders. While designed to protect industries or influence trade balances, these policies often create ripple effects that reshape supply chains and macroeconomic performance.

System Dynamics provides a deeper understanding of how tariff systems work, and what they actually do, by examining the feedback mechanisms that drive system behavior over time. These systems are not just mechanical – they’re shaped by human decisions, shifting incentives, delayed reactions and evolving policy goals.

Ventana’s own Tom Fiddaman will share some models System Dynamics history, and we’ll experiment with an online simulation of tariff impacts.

– Vensim 10.2 is now available (featuring Sensitivity2All and multi-core sensitivity/optimization).

– System Dynamics Conference

– Online courses

– Resources for Vensim users

– Distributors

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– Vensim 10.2 Released

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Vensim 10.2 is now available for download:

– New loops tool. We’ve redesigned the loops tool. You can now highlight structure on a sketch.

– New causal chain tool. Similar to the loops tool, the causal chain tool allows you to find the routes between two variables in a model. You can also highlight these on a sketch as well.

– Multi-core sensitivity on the Mac is now available.

– New custom graph and table editors.

– Upgrades to the search tool now allows you to search within equations. For example, if you need all functions that read an Excel file, you can enter XLS and the tool will only display variables that have equations with “XLS” in them.

If you’re not yet current with 10.2, there are other new developments of note.

– The Sensitivity2All tool within Vensim allows you to quickly identify the most important constants in your model and automatically get an overview of how all constants influence the calculation of any parameter of interest (Patent Pending). Full details are in the help system at https://www.vensim.com/documentation/sensitivity2all.html.

– Multi-run configuration tool. This allows you to store a pre-defined set of experiments that can be re-run with minimal clicks. Full details are at https://www.vensim.com/documentation/run-configuration-tool.html

– In a similar spirit, the new Action Recorder can build command scripts as you run models. https://www.vensim.com/documentation/action-recorder-interface.html

There are also many aesthetic, usability and stability upgrades. Simulation setup and Synthesim controls are better than ever. File format and submodel upgrades enhance team use of source control, even in mixed Windows-Mac environments. For most platforms, the new version includes a crash reporter that can recover model work-in-progress.

Licenced users can download if they have active maintenance from

Academic PLE and evaluation and Model Reader users can download from

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– System Dynamics Conference News & Workshops
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We look forward to seeing you at the 2024 SD conference in Bergen; make sure you stop by our booth to say hello.

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– Online Courses
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We now offer basic, intermediate and advanced online courses in both English and Spanish. Those courses are addressed to students, teachers, researchers, consultants, professionals and public managers.

More information on the web https://vensim.com/vensim-online-courses

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– Resources for Vensim users
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Visit us at https://vensim.com, https://ventanasystems.com and https://www.ventity.biz to keep in touch.

Buy direct at the Vensim store, https://www.vensim.com/store

Get up to speed quickly with Vensim videos: https://vensim.com/vensim-video-library/

Contact sales at [email protected] for Academic and Public Research discounts, volume quotes and other information. See the price schedules at https://vensim.com/purchase/

Extend your maintenance for a year of upgrades by logging in with your license key on the download page, https://vensim.com/download

Contact us: https://vensim.com/contact-us/

Support forum: https://www.ventanasystems.co.uk/forum

Twitter: @Vensim, @VentanaSystems, @VentitySim

Tom Fiddaman’s model library: http://metasd.com/model-library/

More: https://vensim.com/resources/

Facebook:  https://www.facebook.com/VensimSoftware and https://www.facebook.com/VentitySim/

The System Dynamics Society: https://www.systemdynamics.org/

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– Our official distributors
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We have a number of distributors in many parts of the world (Brazil, China, Czech Republic, Slovakia, Poland, Hungary, Slovakia, Latvia, Estonia, Lithuania, Slovenia, Serbia, Croatia and Bosnia and Herzegovina, France, Germany, Japan, Korea, Mexico, Spain, United Kingdom). Some run courses, all can provide tecnical support and help. For contact details, please see

For our UK-based users, please sign up to the Ventana Systems UK newsletter https://www.ventanasystems.co.uk/.  We’ll let you know about upcoming Vensim workshops and any networking events to be help in the UK.

Vensim 9.2

Ventity 4.7

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1. Spring sale sale, through May 20th 2022
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If you’ve been waiting to move to the premier dynamic modeling tool, or to extend your maintenance and upgrade to the latest version of Vensim, now is a great time. All Vensim editions are on sale, 20% off, through mid-May 2022.

Ventity subscriptions continue to be inexpensive at $99 per year, and free for academic users. If you can’t decide, or want to use both (as we do on consulting projects), a Vensim Pro or DSS license includes a Ventity subscription.

Buy direct at the Vensim store,
https://www.vensim.com/store
At the checkout stage, enter the coupon code SPRINGSALE. For academic and public research users, please contact us for the discounts.

Contact sales at [email protected] for volume quotes and other information. Extend your maintenance for a year of upgrades by logging in with your license key on the download page, https://www.vensim.com/download.html

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2. Vensim 9.2 Released
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Vensim 9.2 is now available. There are many aesthetic, usability and stability upgrades. Simulation setup and Synthesim controls are better than ever. File format and submodel upgrades enhance team use of source control, even in mixed Windows-Mac environments. For most platforms, the new version includes a crash reporter that can recover model work-in-progress.

Licenced users can download if they have active maintenance from

https://www.vensim.com/php-bin/download.html

Academic PLE and evaluation and Model Reader users can download from

https://vensim.com/free-download/

We have completely re-written the user interface using the latest graphics engines available on both MacOS and Windows. This future-proofs Vensim and ensures it will remain the fastest and most advanced simulation package on the market today.

We have a set of videos that introduce the new interface and how to use it. These are available as a complete playlist, or you can view individual videos if you need to. All of them are available at the foot of our System Dynamics conference page at
https://www.ventanasystems.com/conference/

The new interface is similar in many ways to the old one so existing users should have no trouble migrating. And we hope it’s more intuitive than the old interface, so new users should find learning how to build models in Vensim a faster process. And there is a lot more to come including new output tools, as well as integration with Forio to allow you to put your simulations online.

Visit the site above and see how the new Vensim looks.

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3. Ventity 4.7
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Ventity 4.7 has just been released. The primary new feature is a relaxation of circularity checking to permit more entity self-references in models of hierarchies like supply chains or projects. In addition, there are many small usability upgrades.

https://ventity.biz/download/

Behind the scenes, a new data and code generation architecture supports use of large models in embedded systems (contact us at [email protected] for details and availability).

If you’re new to Ventity:

The Help system contains a lot of good “getting started” material, including a series of videos, which are also on Vimeo, starting with
https://vimeo.com/134983029

The Ventity support forum is up and running at
https://www.ventanasystems.co.uk/forum/viewforum.php?f=48

If you have Vensim Pro or DSS with current maintenance, you already have a Ventity license. You can look up the key with your Vensim license at https://www.vensim.com/php-bin/download.html

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4.  System Dynamics Modelling with Vensim Workshop – South Africa System Dynamics Chapter.
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As part of the 10th Annual System Dynamics Conference, the South Africa System Dynamics Chapter will host its 1st System Dynamics Modelling with Vensim workshop facilitated by Prof Josephine Kaviti Musango. The workshop will take place on 17th November 2022. The objective of the workshop is to advance a research practice of following the system dynamics modelling process before jumping into the software. Using a single case study, researchers and practitioners will have hands-on modelling using Vensim. The workshop is endorsed by Ventana Systems.

To secure your spot for the workshop, register for the 10th Annual System Dynamics Conference here: http://systemdynamics.org.za/10-sasdc-reg-form/ and select “System Dynamics Modelling with Vensim: Workshop”.

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5. Online courses.
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We now offer basic, intermediate and advanced online courses in both English and Spanish. Those courses are addressed to students, teachers, researchers, consultants, professionals and public managers.

More information on the web https://vensim.com/vensim-online-courses

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6. Applications
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We regularly see impressive applications of Vensim and Ventity and note them on our web sites and social media. If you’ve developed something cool, drop us a note and we’d be happy to share your news!

Here are two that you can run online:

C-ROADS

The latest version of the award-winning C-ROADS climate change policy simulator is powered by Vensim, using Todd Fincannon’s open SDEverywhere transpiler to run in a browser with an elegant interface and speed and interactivity rivaling Synthesim. Its companion En-ROADS is even more elegant.

Energy Policy Simulator

Energy Innovation has an Energy Policy Simulator that lets users explore what it takes to achieve energy and emissions targets, in detail. The simulator has a custom HTML5 interface that runs a Vensim model on servers using the Multicontext shared library. The interface was developed by Todd Fincannon. It has extensive documentation, and the Policy Design Guide explains many energy system policies in the internally consistent framework that a model provides. You can also download and run the open source model on your desktop.

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7. In the Forum
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The support forums at https://www.ventanasystems.co.uk/forum provides quick-turnaround help on a variety of software and modeling questions. It now has over 2000 successfully answered queries, and also contains the archive of the SD mailing list.

A sample of recent topics:

• How to set a Auxiliary with Initial?
• GET DIRECT LOOKUPS with subscript
• Error message when I want to install a new version of Vensim
• model about the staircase elevator problem exposed by Tom in the facebook forum
• Unit errors
• Need help with vensim model
• Stock and flow and TIME STEP
• Embed text in SVG
• choosing the time step
• Options menu on macOS
• Model of data-intensive support service
• temporary effect
• Model equations
• summing subscripts of a LOOKUP variable
• two models explaining how to correct some errors found in the world3 model

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8. System Dynamics Conference News
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Ventana Systems thanks the SD Society for another great conference. We enjoyed meeting new and old friends and seeing new developments in the field. We were happy to see many papers providing runnable models, with many high-quality papers powered by Vensim.

We look forward to seeing you in Frankfurt!

https://systemdynamics.org/conference-2022/

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9. Resources for Vensim users
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Visit us at https://vensim.com, https://ventanasystems.com and https://www.ventity.biz to keep in touch.

Buy direct at the Vensim store, https://www.vensim.com/store

Get up to speed quickly with Vensim videos: https://vensim.com/vensim-video-library/

Contact sales at [email protected] for Academic and Public Research discounts, volume quotes and other information. See the price schedules at https://vensim.com/purchase/

Extend your maintenance for a year of upgrades by logging in with your license key on the download page, https://vensim.com/download

Contact us: https://vensim.com/contact-us/

Support forum: https://www.ventanasystems.co.uk/forum

Twitter: @Vensim, @VentanaSystems, @VentitySim

Tom Fiddaman’s model library: http://metasd.com/model-library/

More: https://vensim.com/resources/

Facebook:  https://www.facebook.com/VensimSoftware and https://www.facebook.com/VentitySim/

The System Dynamics Society: https://www.systemdynamics.org/

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10. Our official distributors
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We have a number of distributors in many parts of the world (Brazil, China, Czech Republic, Slovakia, Poland, Hungary, Slovakia, Latvia, Estonia, Lithuania, Slovenia, Serbia, Croatia and Bosnia and Herzegovina, France, Germany, Japan, Korea, Mexico, Spain, United Kingdom). Some run courses, all can provide tecnical support and help. For contact details, please see

https://vensim.com/contact-us/

For our UK-based users, please sign up to the Ventana Systems UK newsletter https://www.ventanasystems.co.uk/.  We’ll let you know about upcoming Vensim workshops and any networking events to be help in the UK.

They are published in both English and Czech

English edition
https://sciencedynamics.net/index.php/en-us/blog

Czech edition
https://sciencedynamics.net/index.php/cs/blog

2. Vensim 8.2 including Apple M1 processor support

3. Forum daily digests

3. Ventity

4. Online courses.

5. Applications

6. In the Forum.

7. System Dynamics Conference News.

8. Resources for Vensim users.

9. Our official distributors

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1. Ventana Systems News
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Ventana is working on a number of applications that combine models and data to analyze strategies in complex systems:

A state COVID19 response model that interprets test statistics and facilitates resource allocation. The model pools information from the 50 US states, and runs in parallel on HPC servers.

A city/utility low-carbon strategy model that examines relationships among buildings, energy-consuming devices, electric and other vehicles, and utility rates. Key factors influencing the ZNE goal are directly controllable by the utility include pricing, rebate strategy, investment policies, time of use pricing and customer incentive-related policies to accelerate adoption of energy efficient products including tradeoffs between fuel sources and natural gas. Other factors are largely uncontrollable, e.g., governmental policies and technology improvements that lead to market penetration by all-electric vehicles, electric heat pumps and solar energy systems. The utility can incentivize adoption of technology in the city and influence governmental policies in the state. Therefore, it was important for the utility to readily calculate and assess the relative influence of each factor over time to facilitate preparation of rate cases for regulators.

A state energy sustainability platform that allows an energy-producing state to explore alternative pathways that serve de-carbonization, reliability and employment goals, blending CCS and EOR with emerging PV, solar and storage, including a novel statistical treatment of variability.

A model for economic guidance of an economy: In preparation for the country’s strategic plan, upcoming IMF review, and climate commitments to the UN, Ventana was requested to critique a national model through 2045. Review included modeling price formation and market clearing; financing and representation of policy instruments; and representation of poverty and wealth distribution.

An assessment of the science base emerging from the Deep Water Horizon accident, with a meta-model of the Gulf of Mexico’s environmental and economic health. Phase 1 of the task was to capture and synthesize expert knowledge from technical studies of the ten year $500M program. A series of expert workshops facilitated by Ventana captured and diagramed relationships and feedbacks among expert knowledge elements in the major study fields of Physics, Ecosystem, Socio-Economics, and Human Health.

The confluence of challenges we face – COVID, climate, social justice, and political corrruption to name a few, leave us convinced that now, more than ever, technology must support sophisticated, accurate modeling at the breakneck speed of crisis decision making. We remain dedicated to providing tools to support both your most urgent needs and your most important long-term strategies.

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2. Vensim 8.2 Release
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Vensim now runs on the new Apple silicon Macs. The MacOS release of Vensim 8.2 has a universal binary, it runs natively on both Intel and M1 processors. This allows you to use the full potential of the new Apple M1 processor. We’ve spent a lot of time tracking down Mac bugs and idiosyncracies – we think you’ll find performance much improved.

This release continues the rollout of a new graphics framework for model diagrams, with improved looks and usability.

Vensim DSS can now export models to run in web browsers via WebAssembly. Models run on the client side with no latency, so Synthesim provides a good user experience, and you can customize the web side in javascript. You can try one example at http://vensim.com/temp/gomri/ And don’t forget, if you want to run a simulation online with extremely rich output, gaming, and other advanced features, our good friends at Forio can do this (https://forio.com).

Vensim Pro and DSS can now combine submodels. This makes group model development easier and facilitates re-use of models. More details on this and examples are in the help system, browse to “Reference Manual” and then “Sub-models”.

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3. Forum daily digests now available.
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You can now keep an eye on Vensim and System Dynamics related discussions on the forum without visiting it regularly.

More details on how to keep up to date is at http://www.ventanasystems.co.uk/forum/viewtopic.php?f=4&p=29101

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3. Ventity
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Ventity 4.0 Beta 2 will be available shortly, featuring performance improvements for very large models. Diagram behavior now requires fewer clicks, and is a little closer to Vensim. A little further down the road, the 3D data visualizer will be returning.

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4. Online courses.
—————————————————————————————————
We now offer basic, intermediate and advanced online courses in both English and Spanish. Those courses are addressed to students, teachers, researchers, consultants, professionals and public managers.

More information on the web https://vensim.com/vensim-online-courses 

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5. Applications
—————————————————————————————————

We regularly see impressive applications of Vensim and note them at Vensim.com or on social media. If you’ve developed something cool, drop us a note and we’d be happy to share your news!

Here are two that can run live, online:

C-ROADS

The award-winning C-ROADS climate change policy simulator is powered by Vensim, using Todd Fincannon’s open SDEverywhere transpiler. It runs in a browser with an elegant interface, speed, and interactivity rivaling Synthesim. Its companion En-ROADS, is even more elegant.

Energy Policy Simulator

Energy Innovation has an Energy Policy Simulator that lets users explore what it takes to achieve energy and emissions targets, in detail. The simulator has a custom HTML5 interface that runs a Vensim model on servers using the Multicontext shared library. The interface was developed by Todd Fincannon. It has extensive documentation, and the Policy Design Guide explains many energy system policies in the internally consistent framework that a model provides. You can also download and run the open source model on your desktop.

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6. In the Forum
—————————————————————————————————

The Vensim support forum at https://www.ventanasystems.co.uk/forum provides quick-turnaround help on a variety of Vensim questions. It now has over 2000 successfully answered queries, and also contains the archive of the SD mailing list.

A sample of recent topics:

Truncated lognormal

How to map one variable to another variable?

Floating point error in vector lookup and subscript

Matlab and Vensim

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7. System Dynamics Conference News
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The 2021 conference is tentatively planned for July 25-29, 2021. We’ll update you as soon as we learn more. More details on this are at the official website, https://www.systemdynamics.org/conference

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8. Resources for Vensim users
—————————————————————————————————

Visit us at https://vensim.com, http://ventanasystems.com and https://www.ventity.biz to keep in touch.

Buy direct at the Vensim store, https://www.vensim.com/store

Get up to speed quickly with Vensim videos: http://vensim.com/vensim-video-library/

Contact sales at [email protected] for Academic and Public Research discounts, volume quotes and other information.

See the price schedules at https://vensim.com/purchase/

Extend your maintenance for a year of upgrades by logging in with your license key on the download page, http://vensim.com/download/.

Contact us: http://vensim.com/contact-us/

Support forum: http://www.ventanasystems.co.uk/forum

Twitter: @Vensim, @VentanaSystems, @VentitySim

Tom Fiddaman’s model library: http://metasd.com/model-library/

More: http://vensim.com/resources/

Facebook: https://www.facebook.com/VensimSoftware and https://www.facebook.com/VentitySim/

The System Dynamics Society: http://www.systemdynamics.org/

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9. Our official distributors
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We have a number of distributors in many parts of the world (Brazil, China, Czech Republic, Slovakia, Poland, Hungary, Slovakia, Latvia, Estonia, Lithuania, Slovenia, Serbia, Croatia and Bosnia and Hercegovina, France, Germany, Japan, Korea, Mexico, Spain, United Kingdom). Some run courses, all can provide tecnical support and help. For contact details, please see https://vensim.com/contact-us/

For our UK-based users, please sign up to the Ventana Systems UK newsletter http://www.ventanasystems.co.uk/. We’ll let you know about upcoming Vensim workshops and any networking events to be help in the UK.
 

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.

The model:

For PLE/Pro/DSS: community corona 7.mdl

For the Reader (or any other): community corona 7.vpmx.zip

There’s now an update: community corona 8-mdl+vpmx.zip (vpmx and mdl formats)

We’ve also translated it to Ventity, which has some complementary capabilities.

There’s another copy at metasd.com, where you can share comments. Also, check back here for updates to the model.

Epidemic Modeling Tutorial

This companion video builds up the classic SIR epidemic model from basic components, illustrates some Vensim features, and touches some System Dynamics concepts of growth, equilibrium, and loop dominance.

The models are in this package:

Vensim SIR models.zip

They’re distributed under the MIT license, so you can use and adapt them for teaching or any other purpose.

2. Vensim 8 launch sale, throughout the month of September 2019

3. Ventity 3

4. Online courses.

5. Applications

6. In the Forum.

7. System Dynamics Conference News.

8. Resources for Vensim users.

9. Our official distributors

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1. Vensim 8 Release
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Vensim 8 has been released. It’s is now fully 64 bit on both Mac and Windows (you can still download 32 bit versions if you need to).

The Mac version has undergone some significant improvements both to stability and usability. If using DSS, also included is an external function library project, and the scripts to allow models to be compiled. We are working on a dylib for the Mac in a similar way that the Vensim DLL operates on Windows.

• All configurations of Vensim now use double floating point precision for both calculations and results storage
• New file formats to allow compatibility with 64 bit operating systems which also allow very large datasets
• New savelist editors speed up definition of sensitivity runs
• Behavior graphs’ sizing can now be set
• Improved XMILE support
• Translations : Vensim has been translated to Spanish (click Tools->Language and select Spanish)
• Synthesim is enabled for sensitivity simulations, exploiting Vensim’s speed to make risk and uncertainty interactive.

If you’ve been using the beta or first official release (July/early August), it’s worth upgrading to the latest 8.0.1, which contains an important fix for autosaved backups.

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2. Vensim 8 launch sale, throughout the month of September 2019
—————————————————————————————————

If you’ve been waiting to move to the premier dynamic modeling tool, or to extend your maintenance and upgrade to the latest version of Vensim, now is a great time. All Vensim editions are on sale, 20% off, through the end of September 2019.

Buy direct at the Vensim store, http://www.vensim.com/store. At the checkout stage, enter the coupon code LAUNCHSALE. For academic and public research users, please contact us for the discounts.

Contact sales at [email protected] for volume quotes and other information. Extend your maintenance for a year of upgrades by logging in with your license key on the download page, http://www.vensim.com/download.html.

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3. Ventity 3 Release
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We released Ventity 3 at the System Dynamics conference in Albuquerque. We enjoyed the Thursday workshop, where we got a chance to work with serious practitioners on applications that challenge the limits of traditional SD tools.

Ventity 3 includes new user defined macros and a beta geospatial visualization feature (much improved in the latest 3.0.1 edition). We’re particularly excited about this, because Ventity’s data architecture is a natural fit with GIS.

Above: Ventity geospatial visualization of economic impacts of an oil spill in the Gulf of Mexico. Data is sourced from shapefile attribute tables. Entities are linked to polygons and interact by networks. Colors and animation reveal behavior over time.

Ventity is targeted at problems that are hard to solve in most simulation languages. For example:

• Consumer products: build a marketing mix model for a portfolio of products across multiple regional markets, distribution channels, brands and package sizes. Ignore combinations of dimensions that do not exist, and launch or cancel products on the fly.
• Health care: model doctors, patients, diseases and their relationships explicitly, with agents, or in a variety of aggregate styles, including dynamic cohorts (see our paper from ISDC 2017).
• Energy: model a building portfolio with construction and retrofits, preserving the age distribution of buildings without suffering the limitations of coflows and discrete delays.
• Environment: build an integrated assessment model that can change the granularity of emissions from state to country to region to globe at the flip of a switch.
• Logistics: simulate a supply chain, specifying the links among levels with data.

The really big change from most simulation languages is that we’ve replaced arrays with collections of entities, identified by attributes. This makes for a more natural and data-friendly problem description. Detail becomes a property of entities, not equations, which makes it a lot easier to coordinate and change. Entities are modular, so they’re easier to reuse and share among teams. Entities can be created and deleted dynamically, so there’s no need to simulate a lot of zeroes for things that haven’t happened yet. Similarly, a list of entity relationships can represent a sparse matrix, so there’s no need to clutter your model with zeroes for project phases that aren’t prerequisites or relationships that don’t exist among people. All this happens in a development environment with modern, interactive charts and windowing.

Ventity is available with a free trial and academic license, and affordable commercial subscriptions. Vensim Pro and DSS licenses with current maintenance include a commercial Ventity subscription. You can learn more and download a trial at Ventity.biz. If you have a previous expired trial, and would like to take another look, contact us for a license extension. http://www.ventity.biz

If you’re new to Ventity:

The Help system contains a lot of good “getting started” material, including a series of videos, which are also on Vimeo, starting with

http://vimeo.com/134983029

The Ventity support forum is up and running at

http://www.ventanasystems.co.uk/forum/viewforum.php?f=48

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4. Online courses.
—————————————————————————————————
We now offer basic, intermediate and advanced online courses in both English and Spanish. Those courses are addressed to students, teachers, researchers, consultants, professionals and public managers.

More information on the web https://vensim.com/vensim-online-courses

—————————————————————————————————
5. Applications
—————————————————————————————————

We regularly see impressive applications of Vensim and note them at Vensim.com or on social media. If you’ve developed something cool, drop us a note and we’d be happy to share your news!

Here are two can run live, online:

C-ROADS

The latest version of the award-winning C-ROADS climate change policy simulator is powered by Vensim, using Todd Fincannon’s open SDEverywhere transpiler to run in a browser with an elegant interface and speed and interactivity rivaling Synthesim. Its companion En-ROADS, due this fall, is even more elegant.

Energy Policy Simulator

Energy Innovation has an Energy Policy Simulator that lets users explore what it takes to achieve energy and emissions targets, in detail. The simulator has a custom HTML5 interface that runs a Vensim model on servers using the Multicontext shared library. The interface was developed by Todd Fincannon. It has extensive documentation, and the Policy Design Guide explains many energy system policies in the internally consistent framework that a model provides. You can also download and run the open source model on your desktop.

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6. In the Forum
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The Vensim support forum at http://www.ventanasystems.co.uk/forum provides quick-turnaround help on a variety of Vensim questions. It now has over 2000 successfully answered queries, and also contains the archive of the SD mailing list.

A sample of recent topics:

• Is there an equation for counter in Vensim?
• How to run sensitivity simulations with Vensim DLL
• Change the default legend in the custom graph tool
• Interactive and Dynamic Cohorts
• Initializing entities from a stack?

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9. Our official distributors
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We have a number of distributors in many parts of the world (Brazil, China, Czech Republic, Slovakia, Poland, Hungary, Slovakia, Latvia, Estonia, Lithuania, Slovenia, Serbia, Croatia and Bosnia and Hercegovina, France, Germany, Japan, Korea, Mexico, Spain, United Kingdom). Some run courses, all can provide tecnical support and help. For contact details, please see

https://vensim.com/contact-us/

For our UK-based users, please sign up to the Ventana Systems UK newsletter http://www.ventanasystems.co.uk/.  We’ll let you know about upcoming Vensim workshops and any networking events to be help in the UK.