Theory: What is a Sequence Diagram in UML? UML Sequence diagrams are interaction diagrams that detail how operations are carried out. As sequence diagrams can be used to capture the interaction ...

https://en.wikipedia.org/wiki/Sequence_diagram http://my.safaribooksonline.com/book/software-engineering-and-development/uml/0321193687/sequence-diagrams/ch04 by ...