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.You can use an Interaction element to insert an Interaction diagram as a child of a Class element. The State/Continuation element serves two different purposes for Sequence diagrams, as State Invariants and Continuations. This example Sequence diagram demonstrates several different elements.Īn Actor is a user of the system user can mean a human user, a machine, or even another system or subsystem in the model.Ī Lifeline represents a distinct connectable element and is an individual participant in an interaction.īoundary elements are used in analysis to capture user interactions, screen flows and element interactions.Ī Control organizes and schedules other activities and elements.Īn Entity is a stereotyped Object that models a store or persistence mechanism that captures the information or knowledge in a system.Ī Fragment element can represents iterations or alternative processes in a Sequence diagram.Īn Endpoint is used in Interaction diagrams to reflect a lost or found Message in sequence.Ī Diagram Gate is a simple graphical way to indicate the point at which messages can be transmitted into and out of interaction fragments. You generate Sequence diagram elements and connectors from the 'Interaction' pages of the Toolbox. To toggle the numbering of messages on a Sequence diagram, select or deselect the 'Show Sequence Numbering' checkbox on the 'Preferences' dialog.
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