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'''System dynamics''' is a name given by groups such as the [[Economics Chapter of the System Dynamics Society]] to one approach to modeling the [[population dynamics]] of complex systems such as [[ecology|ecological]] and [[Economics|economic]] [[system]]s, which usually interact strongly with each other.
'''System Dynamics''' is one approach to modeling the dynamics of complex systems such as [[Population dynamics|population]], [[ecology|ecological]] and [[Economics|economic]] [[system]]s, which usually interact strongly with each other. Systems Dynamics was founded in the early [[1960s]] by [[Jay W. Forrester]] of the [[MIT Sloan School of Management]] with the establishment of the [[MIT System Dynamics Group]]. At that time, he began applying what he had learned about systems during his work in [[electrical engineering]] to everyday kinds of systems. What makes using System Dynamics different from other approaches to studying [[complex system]]s is the use of [[feedback]] loops. [[Stock and flow|Stocks and flows]] are the basic building blocks of a System Dynamics model. They help describe how a system is connected by feedback loops which create the [[nonlinearity]] found so frequently in modern day problems. Computer software is used to [[computer simulation|simulate]] a system dynamics [[model (abstract)|model]] of the situation being studied. Running "what if" simulations to test certain policies on such a model can greatly aid in understanding how the system changes over time. Actual matters concerning System Dynamics are discussed in the [[Economics Chapter of the System Dynamics Society]].▼
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==See also==
*[[Systems Theory]]
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==External links==
* [http://www.simudyne.com Simudyne] is in the business of building and deploying [[free software|non-free]] computer-based enterprise simulations for corporations - that represent their internal and external worlds - thereby allowing them to make and evaluate decisions in a virtual environment before executing.
* [http://www.systemdynamics.org The System Dynamics Society] is an international, nonprofit organization devoted to encouraging the development and use of systems thinking and system dynamics around the world.
* [http://web.mit.edu/sdg/www/ MIT System Dynamics Group]
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* [http://www.anylogic.com/ AnyLogic] (Supports system dynamics, agent based and discrete event modeling)
* [http://www.simulistics.com/ Simile] (System Dynamics software with object-based concepts)
* [http://www.vensim.com/ Vensim] (free (zero-cost) for educational and personal use)
* [http://www.simtegra.com/ MapSys] (
* [http://www.consideo.de/ Consideo] (
* [http://www.powersim.com/ Powersim] (System dynamics software)
* [http://www.forio.com/ Forio] (Web based system dynamics software)
* [http://www.iseesystems.com/ Stella and iThink] (System dynamics software)
*[[NetLogo]] (Multi agent simulation with an easy to use interface. This software is being used by children in schools, and can also simulate very complex systems.)
*[http://www.visualbots.com/index.htm VisualBots] - [[Freeware]] multi-agent simulator in Microsoft Excel - Visual Basic syntax
*[http://www.excelsoftware.com/maca&dosx.html MacA&D] - Macintosh tool to model, simulate and graph dynamic systems
*[http://www.excelsoftware.com/wina&dproducts.html WinA&D] - Windows tool to model, simulate and graph dynamic systems
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