The order of objects and messages can be altered to make the diagram more readable and notes can be used to explain parts of the diagram. The choice will depend on what the modeler wants to represent. The elements that appear in Sequence diagrams can be either Classifiers such as Classes and Components or instances such as Objects and Component Instances. Sequence diagrams can also be created automatically from stack traces as a way of visualizing how a system functions. They are particularly useful when used to describe complex protocols or subsystem interactions that are difficult to understand unless presented graphically.

They are more typically used by technical modelers to depict how messages are passed between application components and interfaces to achieve an outcome. The Sequence diagram can be used to model any set of messages that flow between two or more elements to produce a result. Ribbon: Design > Diagram > Add > UML Behavioral > Sequenceīrowser window Toolbar : New Diagram icon > UML Behavioral > Sequenceīrowser window context menu | Add Diagram.

How to draw sequence diagram online