Sequence diagrams

Sequence diagrams also use Objects and messages (:operations' call).

They are well suited to represent timing constraint (e.g. in real time software) with:

• time instant a message is sent
• duration to receive the message (e.g. transfert delay)
• duration to return a response

Sequence diagram (with times)

• Communication diagrams use object and space
• Sequence diagrams use objects and time