While it is possible to make discrete variables in Vensim, this is usually only sensible if there are a small number of such variables relative to everything else in the model.Ī discrete event simulation moves forward by allowing each entity to choose the next time it needs to do something (be fully assembled, change to a different workstation, and so on). This is to be contrasted with discrete event simulation in which individual entities are tracked and the results added up to report behavior. What this means is that it is best suited to situations where most of the variables change continuously, and not in increments. We often refer to Vensim as supporting continuous simulation. Technically, Vensim and other system dynamics packages are capable of solving systems of lumped ordinary difference or differential equations. What is the difference between discrete and continuous? Arms races, stock market bubbles, inner city degradation, and instability in manufacturing volume requirements are all examples of behaviors that result from feedback. Feedback loops typically involve more than one person or organization, each responding to the actions of another in such a way as to, eventually, change the behavior of others. Though feedback is a very simple concept, its implications can be quite surprising. For example, if you are trying to catch a person running in front of you it is necessary to run faster till you get beside them and then slow down to match their pace. Feedback is a process in which a decision or action causes changes to occur which, after a time, cause a revision of the decision or action.
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