Key Points
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A model is an abstract view of a system that deliberately ignores some system details. Complementary system models can be developed to show the system’s context, interactions, structure, and behavior.
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Context models show how a system that is being modeled is positioned in an environment with other systems and processes. They help define the boundaries of the system to be developed.
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Use case diagrams and sequence diagrams are used to describe the interactions between users and systems in the system being designed. Use cases describe interactions between a system and external actors; sequence diagrams add more information to these by showing interactions between system objects.
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Structural models show the organization and architecture ...
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