![]() 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. Most elements we cover in use case diagrams remain in use throughout a system sequence diagram, including: 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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