Sequence Diagram

From dis-Emi-A

A sequence diagram can be considered to be a specialized form of a Test Flowchart which is best suited to modeling sequential interactions between parts of a system. One needs to use a sequence diagram in cases where there are parallel activities, and in particular when those parallel activities synchronize with each other.

Look to Introduction to UML Sequence Diagrams for the basics on constructing the diagrams.

Once you have a diagram produced, the same rules apply as in the Test Flowchart. States become a timeframe on each column in the diagram, and transitions are the arrows between the columns. Each transition and state is labeled as per usual and subject to Input classification.