Objects that are created and destroyed dynamically (transient objects) have object lifelines that begin and end with a receipt of a message. Objects that exist throughout an interaction should appear at the top of the object dimension with their lifelines drawn parallel to the Time dimension. Sequence Diagrams show elements as they interact over time and they are organized according to object (horizontally) and time (vertically):Īn object lifeline represents the existence of an object over some time. The objects involved in the operation are listed from left to right according to when they take part in the message sequence. The time progresses as you go down the page. Sequence diagrams are organized according to time. Sequence Diagram is an interaction diagram that details how operations are carried out - what messages are sent and when. high-level interactions between the user of the system and the system, between the system and other systems, or between subsystems (sometimes known as system sequence diagrams).
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