A submodel is first and foremost a way of grouping together a number of other model elements, including other submodels. This is done by either drawing a submodel envelope around a number of elements in the model diagram, or by creating an empty submodel and inserting model elements into it.
However, the reasons for wanting to do this are many and varied, and it is important to appreciate that the submodel construct can be used for a range of modelling needs. There are considerable benefits to using a single method to fulfil this range of needs, both in reducing what you need to learn, and keeping the resulting models simple and flexible.
This section overviews the different uses of the submodel construct, and the different types of submodel that you can have. Other sections provide more detail on particular topics.
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