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3.9) Notation


Throughout this course, we will use a standard notation for stocks and flows that is consistent with the Vensim modelling environment, as well as other system dynamics software packages like Stella. A stock is represented by a box:


Flows are represented by arrows that have a source and a sink:


In this case the source is not determined and the sink is the stock. This diagram could be a representation of births (the flow) adding to a population (the stock).