![]() Two or more message sequences exist, and a choice must be made between the two of them.Ī sequence can only occur under certain circumstances. ![]() Objects or parts of a system that interact during the sequence. Now that we have discussed what it is and its purpose, let’s take a look at some commonly used symbols and components in a sequence diagram. This documentation can be passed on to other persons or organizations. To be used as a handy form of documentation on how a system functions. To show the time order in which events occur. To illustrate interactions between actors (system users) and the system, or various parts of a system. So when should sequence diagrams be used, and what can they be used for? They are most commonly used by software developers but have been increasingly adopted within business settings as well, due to its ability to show how a system operates clearly. Such diagrams typically illustrate how different parts of a system interact with each other, and in what order, to achieve an outcome. Sequence diagrams are commonly used by developers to depict interactions between objects in a use case (actions that show interactions between an actor and a system to achieve a goal).
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