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System Sequence Diagram (Describes (Actor generates the events (Solid Line…
System Sequence Diagram
Describes
The behavior of the system In response to the events generated by Outside world
Interaction of the system with external actors as a blackbox
Actor generates the events
Solid Line with arrow
Actor sends a request to the system
Request to the system is a function call with parameters,
The function is available as a method in the system
System generates a response
Dashed Line with arrow
system does not make a request to Actor
Only generates response
response can be optional if there is no return values from previous functions.
UML
Actor
represented as anaonmyos object
System
Also represented as anonymous object
Dotted Vertical Line Indicates a Life line
When the interaction Ends, an "X" is indicated to show the end of life line
Rectangle box with a guard condition indicates iteration
Known as iteration box
SSDs are
Pictorial representation of use cases
Scenario/use Case specific
Generated by Analyst
Significance
Designers generates design artifacts using SSD
Equips designers with External events that the system handle
Helps in creating GUI