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use case description
a textual model that lists and describes the processing details for a use case
preconditions
conditions that must be true before a use case begins
postconditions
what must be true upon the successful completion of a use case
system sequence diagram (SSD)
a diagram showing the sequence of messages
between an actor and the automated part of
the system during a use case or scenario
lifeline, or object lifeline
the vertical line under an object on a sequence diagram to show the passage of time for the object
loop frame
notation on a sequence diagram showing repeating messages
true/false condition
part of a message between objects that is evaluated prior to transmission to determine whether the message can be sent
opt frame
notation on a sequence diagram showing optional messages
alt frame
notation on a sequence diagram showing if-then-else logic.
CRUD technique
an acronym for Create, Read/Report, Update, and Delete; a technique to validate or refine use cases
scenarios or use case instances
a unique set of internal activities within a use case
Note 
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