The name of the message is placed on top of the arrowed line. A message is shown as an arrow coming from the activation box of the object that sends the message to the activation box of the object that receives the message. Message: A message is a connection between two objects. The lifeline can be terminated with an X. A call to activate is depicted by an arrow with a solid arrowhead leading to the activation object. LifeLineĢ Activation Box: An activation box displays the period during which an operation is implemented. A lifeline is drawn as a dashed line that vertically go down from each object box to the bottom of the page. Lifeline: A lifeline displays the lifespan of an object during the scenario being modelled in a sequence diagram. Sequence diagrams have some components, which include:ġ. The order of the messages is represented in a top-down and left-to-right sequence starting with the first message at the top left of the page and successive messages appear to the right and below. The messages that are sent from one object to the next are depicted with horizontal arrows. Occupying a column of space on the page bordered by a vertical line stretching down to the bottom of the page. The objects that send messages to each other are depicted as boxes that are aligned at the top of the page from the left to the right, with each object The diagram depicts information in a horizontal and vertical alignment. Sequence diagrams are also used to show how software components interact. The sequence diagram shows how the objects used in the scenario are connected, but not how they are related to one another. The classes needed to implement the scenario and the messages they pass to one another which are triggered by steps in the use case are displayed on the diagram. Business analysts use sequence or event diagrams to model the logic of management scenarios by showing the information passed between objects in the system through the execution of the scenario.Ī sequence diagram shows how processes are connected during a scenario.
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