State and describe any four notations used in use-case diagram. OR Explain the notations used in use case diagrams.

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written 6.8 years ago by

teamques10 ★ 70k

• modified 6.8 years ago

Notations used in use case diagram are:

1.Use case: Use case is the description of set of sequences of actions. It is graphically represented as an ellipse and labeled with the name of the use case. Use case represents an action performed by a system.

Notation:

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2.Actor: An actor represents a coherent set of roles that users of use case can play while interacting with use cases. An actor represents a role that a human, hardware device or another system plays when it communicates with the system.It is represented with the stick man notation.

Notation:

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3.Communication Line: A Communication line is a connection between an actor and use case. It indicates that both are communicating with each other. Communication line is represented with a solid line.

Notation:

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4.System Boundary: System boundary specifies the scope of an application in order to specify functionality. It indicates what the system includes and what it omits. System boundary groups together logically related things. It separates use cases and actors involved in the system.System boundary is shown with a box in a use case diagram.

Notation:

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