sequence diag

• sequence diagrams are used to show the sequence of an interaction between actor and system in a specific case. vertical dashed line = lifeline

  
• alt interaction box = 'decision' affected outcome. full line = message/input, dashed line = return

  
• objects can make calls to themselves
• storyboard = shows how scenario would be executed, good for user interface, use case = derived from scenario, activity diagram = models the process, sequence diagram = sequence of specific interactions in a specific run