Interaction Diagrams Sequence Diagram

• Objects are represented by means of vertical lines (“lifelines”)

  • depict also the time line
  • the horizontal ordering of the objects has no meaning

• An activation (“focus of control”) shows the period during which an object is directly or indirectly executing an operation

• Messages between objects are denoted by means of arrows

• [Guard] specifies conditional sending of messages

: User

: Calendar

totalDuration()

return(total)

duration()

return(meetingTime)

duration()

return(meetingTime)

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