11+ Relations In Use Case Diagram. Use case diagrams are defined as diagrams that capture the system's functionality and requirements in uml. Hence, when a system is analyzed to gather its functionalities, use cases are prepared and actors are identified.
You would add either a constraint or some explanation in the uc description to tell that it is also used for a thesis but never. It visually depicts the scope of the solution, the actors involved, and the use cases. Your system (4) is whatever you are developing.
A use case describes how a user uses a system to accomplish a particular goal.
11+ Relations In Use Case Diagram. Use case diagram is a pictorial representation of a user(s) actions in a system. Use case diagrams are used to gather the requirements of a system including internal and external influences. In order to fulﬁl the uml philosophy. A line between actors and use cases.