What is System Sequence Diagram? A sequence diagram shows object interactions (communications) set in time sequence. It shows the objects and classes tangled in the state and the order of communications exchanged between the objects required to carry out the functionality of the state. They are typically related with use case understandings in the Logical or Rational View of the system under progress. Sequence diagrams are occasionally called event diagrams or even event scenarios. A sequence diagram displays, as parallel vertical lines which means lifelines, different procedures or objects that live instantaneously, and, as horizontal arrows, the communications exchanged among them, in the same direction in which they happen. This permits the requirement of modest runtime situations in a graphical style. In short… Sequence Diagrams includes: The interaction or the communication that takes place in an association that either understands a use case (generic diagrams) H