1. Sequence Diagrams
Getting the Message

2. Overview
Sequence Diagrams are used to model the interactions among classes
They are used at all stages of the development process
Often they are used to show how Use cases are distributed assigned to various objects

3. Basic Elements

4. Database Update Sample

5. Message types

6. Message Descriptions
Synchronous messages indicate that the flow is interrupted until the message is completed
Return shows that control has returned to the calling object
Asynchronous used for messages that are sent, but from which the active object doesn’t wait for a reply
Flat makes no distinctions between synchronous and asynchronous

7. Message to Self

8. Creating objects

9. Adding States

10. Branching

11. Alternate Flows