Each object has a column and the messages exchanged between them are represented by arrows. Sequence Diagram NotationsĪ sequence diagram is structured in such a way that it represents a timeline that begins at the top and descends gradually to mark the sequence of interactions. They can be used to model both simple and complex interactions between objects, making them a useful tool for software architects, designers, and developers. Sequence diagrams are commonly used in software development to illustrate the behavior of a system or to help developers design and understand complex systems. In simpler words, a sequence diagram shows how different parts of a system work in a ‘sequence’ to get something done. They illustrate how the different parts of a system interact with each other to carry out a function, and the order in which the interactions occur when a particular use case is executed. Sequence diagrams, commonly used by developers, model the interactions between objects in a single use case.
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