読み物小舖 -- 4+1 View of UML Diagrams

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Considering that the UML diagrams can be used in different stages in the life cycle of a system, let us take a look at the "4+1 view" of UML diagrams. The 4+1 view offers a different perspective to classify and apply UML diagrams. The 4+1 view is essentially how a system can be viewed from a software life cycle perspective. Each of these views represents how a system can be modeled. This will enable us to understand where exactly the UML diagrams fit in and their applicability.

These different views are:

Design View: The design view of a system is the structural view of the system. This gives an idea of what a given system is made up of. Class diagrams and object diagrams form the design view of the system.
Process View: The dynamic behavior of a system can be seen using the process view. The different diagrams such as the state diagram, activity diagram, sequence diagram, and collaboration diagram are used in this view.
Component View: Next, you have the component view that shows the grouped modules of a given system modeled using the component diagram.
Deployment View: The deployment diagram of UML is used to identify the deployment modules for a given system. This is the deployment view of the
Use case View: Finally, we have the use case view. Use case diagrams of UML are used to view a system from this perspective as a set of discrete activities or transactions.