In the user authentication process we describe, the messages show how a user enters information into the browser to gain access to the webpage and how the web browser will then cross-check credential to the designated application. As the following figure illustrates, when you create a sequence diagram, the collaboration and the interaction appear in the Project Explorer view, and an interaction frame appears in the diagram editor. What information is passed from one object to another? The other set of components you must identify are the messages the objects will send. The objects, sometimes called actors, are the principal players that perform tasks and send messages.įor example, in a login sequence, two of the objects would be the potential visitor or user and the login page a visitor uses to interact with the platform they’re attempting to log into. The first necessary set of components are the objects. To accomplish these goals, you must first identify the components of your system that should be diagrammed. Map out a real or hypothetical scenario that has many different components. It also models if-then-else logic in the sequence diagram. A sequence diagram is an interaction diagram that details how operations are carried out - what messages are sent and when. See how objects and components interact with each other in sequence to complete a process. The alternative combined fragment is utilized in a sequence diagram to define a section of a cluster of lifelines/actors, representing conditional flow. Model how a complex procedure or system operates. system sequence diagram and the activity diagram. ![]() state chart diagram and the problem domain class diagram. The are the primary models from which other models draw information. What objects must exist prior to the use case executes. You can accomplish several critical tasks with a sequence diagram. What business conditions must occur before the use case is invoked.
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