Participants do not necessarily live for the entire duration of a sequence diagram’s interaction. Return message indicates a return from a procedure call.The receiver and sender of an asynchronous message are working concurrently. The sender of a message passes the signal to the receiver of the message via the message and then continues its activity without waiting for the receiver to return the message or control.The sender of a message passes control to the receiver of the message, then stops the activity and waits for the receiver of the message to give up or return control which is used to indicate synchronization.Messages are generally classified as Synchronous Message, Asynchronous Message, and Return Message.The top and the bottom of the rectangle are aligned with the initiation and the completion time respectively. It represents the period during which an element is performing an operation. It can be interpreted as a pair of brackets in C semantics represented by a small rectangle. Focus of Control (also known as the activation period) is the symbol for the time period during which the object will perform the corresponding operation.Place the object that initializes the whole interaction activity at the leftmost end.Ī dashed line extending down from the object icon in the timing diagram, indicating how long the object has existed.The left and right order of the objects is not important, but in order to make a clear and neat diagram, the following two principles should be followed: put the objects with frequent interactions as close together as possible.Shows only the object name but not the class name, e.g.: lecturer in the timing diagram, it is represented by “object”.Īll three naming methods are available, which is the easiest for people who read the chronological chart to understand, choose which one.
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