Below the title corner, click the prompt if you want to enter the conditions that would end that process. Use the sizing handles on the fragment shape to ensure it encloses all of the related interactions.ĭouble-click in the title corner of the fragment shape to add a title or short description of the process enclosed by the fragment. To add another condition, drag an Interaction operand onto the shape.ĭrag the fragment shape to the interactions it relates to. The fragment comes with two sections, which let you show the alternative interaction. Use the Alternative fragment shape for an if-then or if-then-else process or interaction. Use the Optional fragment for steps that are only performed if a certain condition is met. Use the Loop fragment for a basic repeating interaction. If one or more interactions form a loop, or require a condition to be met to end the interaction, enclose those interactions in a fragment shape: To change the shape of a connector message:Īt the bottom of the pop-up menu, select from the three options ( Right-Angle, Straight, Curved).Ĭlick and drag the connector to change its shape. Use the Asynchronous Message shape to show when an action might not happen immediately. Use a Self Message to represent a recursive call of an operation, or one method calling another method belonging to the same object. Use a Return Message shape (a dashed line) to represent a response to a prior message. Use a Message shape (a solid line) to represent a request or the transmitting of information. The connections points disappear when you are done dragging.Īttach the beginning endpoint to the lifeline sending the message, then drag the head endpoint to the lifeline receiving the message.ĭouble-click the message shape to create a text box, and type a name for the message. A green circle appears at the endpoint when it glues to a connection point. Visio helps you glue the message endpoints to each lifeline. Use an Actor lifeline shape for each participant, and an Object lifeline shape for each system component in your process. To rename text labels, double-click the labels. Now, drag shapes you want to include in your diagram from the Shapes window to the page. This option makes connection points appear when you start connecting shapes. On the View tab, make sure the check box next to Connection Points is selected. If you still don’t see it, click the Expand the Shapes window button on the left. If you don’t see it, go to View > Task Panes and make sure that Shapes is selected. You should see the Shapes window next to the diagram. (A description of each one is shown on the right when you select it.) Then select either Metric Units or US Units. In the dialog box, select the blank template or one of the three starter diagrams. Or if you have a file open already, click File > New. Drag shapes from the stencil onto the drawing canvas to build the diagram. identify the data that is passed as part of the interactions.To build a sequence diagram, use a UML Sequence template or starter diagram, which includes the UML Sequence stencil.identify the objects that participate in an interaction.identify the communication required to fulfill an interaction.allow seeing the specific questions, commands, and data being communicated during the execution of a specific task.Sequence diagrams are valuable because they: plan and understand the detailed functionality of an existing or future scenario.analyze the interaction of objects and components to complete a process.model the logic of a sophisticated procedure, function, or operation.represent the details of a UML Use Case.The main benefit of the diagram is that it helps to identify the messages exchanged between objects. The purpose of the Sequence diagram is to represent some aspect of the communication between objects to perform a task. Activation bars as the Execution Specifications (new modeling approach).There are two Sequence Diagram modeling approaches: The horizontal ordering of the objects is not significant to the operation, and you can rearrange them as necessary. The time axis could be an actual reference point by placing the time labels as text boxes. The diagram has two dimensions: the vertical axis representing time and the horizontal axis representing the participating objects. The Sequence diagram is a type of Interaction diagram ( which falls under the behavioral diagramming family) that focuses on the Message interchange between various Lifelines.Ī Sequence diagram shows the interaction information with an emphasis on the time sequence.
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