SD: Project Management Sequence Diagrams Assignment

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SD Project ManagementSequence
DiagramsAssignment 4

• Laura Ignat
• Marta Wach
• Kapil Gandhi

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Sequence Diagrams

• Focus on how messages are sent between objects
  over time.
• Flow of Control If the object returns a flow of
  control or returns a value, a return message
  (dashed line with arrowhead) goes back to the
  original object.
• Activation Rectangles along lifelines
  represent duration of an activity.

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Term and Definition

• Actor Is a person or system that derives benefit
  from and is external to the system. Participates
  in a sequence by sending and/or receiving
  messages. Is placed across the top of the
  diagram.
• Object Participates in a sequence by sending
  and/or receiving messages. Is placed across the
  top of the diagram.
• Life Line Denotes the life of an object during a
  sequence. Contains an X at the point at which
  the class no longer interacts.
• Focus of Control Is a long, narrow rectangle
  placed on the lifeline. Denotes when an object is
  sending or receiving messages.
• Message Conveys information from one object to
  another.
• Object Destruction An X is placed at the end
  of an objects lifeline to how that it is going
  out of existence.
• Taken from Dennis, Wixom, Tegarden, System
  Analysis and Design

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Sequence Diagram