The general guidelines for use cases are: If actors in your system need to interact with each other, you might consider a separate use case diagram to depict this interaction.ДЄ use case represents an action, and thus the names should begin with a verb. It is important to note that actors donвЂ™t interact with other actors. To enable quick highlighting of the critical roles in the system, you must place the primary actors on the left side of the diagram.Д®xternal systems are also actors in your use case diagram.

Also, use generalized names to make the modification and presentation simpler. Give meaningful and relevant names to the actors. The general guidelines for identifying the actors are: An actor is a person, an organization, or an external system that interacts with the application being analyzed. In the analysis phase, these diagrams provide an outside view of a system by identifying the system's external and internal factors.ДЄctors are the external users that interact with a system. Use cases are also convenient in requirement gathering and documentation. Use case diagrams to represent the basic flow of events through use cases. Use case diagrams are used to define and organize functional requirements in a system along with specifying the context. They show how a user will trigger a response from the system and what is the expected response. They represent the end-user interaction goals and methods. UML use case diagrams are used for many purposes, for example: Thus, they provide a high-level analysis of the design from the outside without worrying about the functionality details. These requirements are later translated into design choices and development priorities.ДЄpart from the interaction model, use case diagrams also help to identify internal or external factors that can influence the workflow of the system.

Use case diagrams to help to visualize the functional requirements of a system. In UML, the purpose of a use case diagram is to demonstrate the different interaction methods for the end-user.

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