What is an USECASE? Why it is needed?

Answer Posted / zerozero

Types of UML Diagrams:
1. Use case Diagram
2. State Diagram
3. Class diagram,
4. Sequence diagram
5. Collaboration diagram


Use case: A set of scenarios that describing an interaction
between a user and a system, including alternatives.

Use case diagram-Uses:
Used for describing a set of user scenarios
Mainly used for capturing user requirements
Work like a contract between end user and software developers

Use case diagram-Core components:
a) Actor b) Use case c) System boundry

Use case diagram Relation's:
a)Association B) Generalization c) Include d) extend

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