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A system analysis is always based on a model, which is a simplification of the system or of one or more properties of the system. Many types of models are available. Among these are system structure models, also called architecture models, functional models, state transition models, and so on. System modeling helps the analyst to understand the structure and functionality of the system. Models may further be used to communicate with other stakeholders to the risk assessment. The IEV defines a model as follows: