Software Ideas Modeler offers tools for following elements of a use case diagram:
- Actor
- Use Case
- Collaboration
- Association
- Include
- Extend
- Generalization
- Realization
- System Boundary
Actor
An actor represents a role in a system. It is not a specific user or person. It can be a human role, an external system or an application.
Use Case
An use case represents functionality of an analyzed system, it captures a requirement. It defines interaction between a role (actor) and a system. It specifies actions which lead to achieving a goal.
Use case has these parameters:
- Name
- ID
- Brief description
- Primary Actor
- Scope - it can be organization black box, organization white box, system black box, system white box or component
- Level - it can be very high summary, summary, usergoal, subfunction or too low
- Precondition
- Postconditions
- Minimal guarantees
- Success guarantess
- Triggers
- Frequency of use
- Priority
- State - it can be draft, review, final or cancelled
Extend
An extending use case extends the behaviour of an extended use case. The extended use cases is dependant on the extending use case. Extend allows you to define a extension point, which refers to the step in the flow where the use case is extended.
The arrow of this relationship points from an extending use case to an extended use case.
Include
An including use case is dependant on an included use case. The included use case is a mandatory part of the including use case.
The arrow of this relationship points from an including use case to an included use case.
System Boundary
System boundary is a rectangular area which helps you to divide use cases into visual groups.
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