Use case diagram of UML

Use case diagram

the use case diagram describes a Function Unit , help the development team to understand the functional requirements of the system in a visual way. The following elements are contained in the use case chart: animation author ( actor ), use cases, relationships .

1. Author ( Actor ) : Functions that can be played by system users Role ( Role ). These users may be people, maybe other computers, some hardware, or even other software systems. The only criterion is that they must be able to stimulate the system part and receive the response outside the system part of the case. (Users who use the system or other systems related to the system)

2.Use Cases: The operations or functions that the role expects the system to provide.

3.Link:The relationship between the user and the use case, and between the use case. Link types include:

①. Association Association ② . Dependency Dependency ③. Include ④ . Extension Extend ⑤ . Generalization generalization