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Lifelines may begin with a labeled rectangle shape or an actor symbol. A dashed line, known as a lifeline, represents events in an SSD. Within a SSD, this shape models the system as a black box (a system with inner workings that are not immediately visible).Īctors - shown by stick figures, actors are entities that interact with the system, and yet are external to it.Įvents - the system events that the actors generate in the sequence. Objects - this box shape with an underlined title represents a class, or object, in UML. We can start by considering the actors we’ll use. You might like to rename Welcome diagram to something else. Select the existing example code and delete it so that you can start fresh. Most elements we cover in use case diagrams remain in use throughout a system sequence diagram, including: Open up the Gleek.io app and select sequence diagram from the dropdown menu in the code field. Use case diagrams are simply another diagram type which represents a user's interaction with the system. Standard sequence diagrams show the progression of events over a certain amount of time, while system sequence diagrams go a step further and present sequences for specific use cases. This language provides a toolkit for diagram creators to make and read diagrams that are comprehensible regardless of location or industry. System sequence diagrams, also known as SSD, are actually a sub-type of sequence diagrams, whose style and notation is dictated by the Unified Modeling Language.
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