ITM 305 Lecture Notes - Lecture 7: Sequence Diagram, Unified Medical Language System, Activity Diagram
15 Dec 2017
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Itm 305 lecture 7 (no lecture 6 cause of midterm) Draw a system sequence diagram for each use case scenario. A system sequence diagram shows the interaction between an actor and the system for one use case scenario. It shows: the system (as a black box, the initiating actor, each external system which sends messages to the system, the messages into and out of the system, the sequence in which the messages occur. Special case for a sequence diagram: only shows actor and one object, the one object represents the complete system, shows input & output messaging requirements for a use case. A system sequence diagram focuses on the content and structure of the system input. It should show whether any messages are repeated or are alternatives. A system sequence diagram is not the place to show the design of the detailed interaction between the user and the system.
