Sequence Diagrams
A use case is still very much a textual description and is subject to interpre tation. A sequence diagram is used to express the use case in more precise, technical terminology. This is achieved by depicting the use case in terms of interaction between the actor and the system.
A sequence diagram is a type of interaction diagram in the UML. The other kind of interaction diagram is called a collaboration diagram. Sequence diagrams capture a specific scenario, with a use case typically consisting of one or more scenarios (for example, main workflow and alternate workflows). The emphasis in a sequence diagram is on the time ordering of the interaction. Thus, the vertical axis represents the time dimension in a sequence diagram. ...
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