1. Time Sequence Diagram Dr. Zhen Jiang West Chester University
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2. Time Sequence Diagram
A sequence diagram is an interaction diagram that focuses on the time ordering of messages
A vertical dashed line is used to represent the lifetime of an object (it’s the object’s lifeline)
A focus of control is a tall, thin rectangle that shows the period of time during which an object is performing an action

3. requestLdgClearance(r)
It’s a repetition of associate member function
Any object of class Pilot
: Pilot
: ATC
: Radar
requestLdgClearance(r)
checkWeather *
Asynchronous action
checkRunwayClear(r)
clear
clearance
Synchronous action
Focus of action

4. An Example of Time Sequence Diagram

5. Another Example

6. Another Example