ITM 305 Lecture 5: Chapter 5
6 Sep 2018
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Use case descriptions: use case description: a use case description lists and describes the processing details for a use case. Implied in all use cases is a person who uses the system. The system sequence diagram identifying inputs and. Ssd notation: figure 5-6 shows a generic ssd, as with a use case diagram, the stick figure represents an actor a person (or role) that interacts with the system. In a use case diagram, the actor (cid:498)uses(cid:499) the system, but the emphasis in an ssd is on how the actor (cid:498)interacts(cid:499) with the system by entering input data and receiving output data. In ssds and all other interaction diagrams, analysts use object notation instead of class notation. The sequence of messages is read from top to bottom in the diagram: the arrows between the lifelines represent the messages that are sent by the actor.
