Key Points
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.
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.
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.
Structural models show the organization and architecture ...
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