The type of arrow depends on the type of message: Messages are communication between objects and are represented with arrows. Lifelines are vertical lines used to represent objects that send and receive interactions throughout the sequence. A single sequence diagram can describe just one scenario or multiple scenarios. ScenariosĪ scenario is the systematic execution of one specific path. It’s usually helpful to define use cases before creating a sequence diagram, as this will provide necessary context for the diagram’s structure. Use cases in UML are specifications of a sequence of events performed by a system, including its variants. Here are a few of the terms and symbols you will need to know before creating a sequence diagram. Back to top Common Sequence Diagram Symbols and Notation However, they can be created any time as a way to document existing systems.Īlthough sequence diagrams are very technical, they still provide a slightly higher-level view than code itself, so they can also be used to communicate system requirements to business executives and other non-technical stakeholders. Architects and developers use them to visualize how the system should behave and provide a helpful framework to use throughout the design process. Sequence diagrams are often created and used during a future system’s planning phase. They represent the details of a UML use case and the logic behind how objects and components interact with each other throughout a process. Sequence diagrams are most commonly used by technical teams. TRY GLIFFY What is a Sequence Diagram Used For? To add a sequence diagram directly to your Confluence documentation, add Gliffy to your Confluence space (it's free for 30 days!): Sequence diagrams are an important type of application architecture diagram to include in technical documentation because they outline system requirements, making them a valuable planning, decision-making, and onboarding resource. Common Sequence Diagram Symbols and NotationĪ sequence diagram, also sometimes called an event diagram, is a type of UML interaction diagram that illustrates the interactions between objects in a system in the order that they occur.
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