The SysML Sequence diagram also describes a system's dynamic behaviour, like the Activity diagram, but it is more precise. It informs not only about the order of actions and which structures perform the actions, but also provides information about the structures which invoke a particular action. For this reason, Sequence diagrams tend to become complex unless they focus on a very specific scenario. The image below shows a fragment of a SysML Sequence diagram from the Bank_SysML.ump example project.
SysML Sequence diagram
The SysML Sequence diagram follows the UML specification. Designing this diagram in UModel requires no specific knowledge compared to the standard UML Sequence diagrams. For general information about the latter, see Sequence Diagram.