Explain what is design and models, why models are necessary in analysis and design? Explain which types of models are required for the development of software or system and provide the examples for major elements of object model. What is the use is of “include” and “extends” relationships in use-case diagram, illustrate with example in Visual Paradigm
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A use case diagram is usually simple. It does not show the detail of the use cases:
It only summarizes some of the relationships between use cases, actors, and systems.
It does not show the order in which steps are performed to achieve the goals of each use case.
As said, a use case diagram should be simple and contains only a few shapes. If yours contain more than 20 use cases, you are probably misusing use case diagram.
The figure below shows the UML diagram hierarchy and the positioning of the UML Use Case Diagram. As you can see, use case diagrams belong to the family of behavioral diagrams.
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