Model diagram elements
Elements of the model diagram
Simile model diagrams are constructed from the following set of 11 symbols. The first four, the compartment, flow, variable and influence, are the fundamental elements of all System Dynamics models. All models will include one or more of these elements.
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An amount of some substance |
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A process moving a substance between compartments |
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A constant or variable quantity |
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Represents the fact that one quantity is used to calculate another |
Simile has a very rich concept: the submodel, which allows model elements to be grouped to represent an object or multiple objects. One chapter of the help is dedicated to the submodel concept. The following symbols are used in models involving submodels.
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An envelope enclosing a group of model elements, collectively representing a class of object |
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A process creating the initial number of instances of a population submodel |
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A process creating new instances of a population submodel |
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A process creating new instances of a population submodel for each existing instance |
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A process destroying instances of a population submodel |
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Represents the fact that one object is associated with another, with each playing a role in the association |
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Represents the fact that an instance of a submodel can exist only under specific conditions |
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Represents an iterative loop within a single time-step |
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