![]() ![]() 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. 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. 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. A 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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