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Use Case Model
A collection of models that can be used to capture system requirements based on use cases with the object-oriented approach.
System Sequence Diagram (SSD)
A diagram showing the sequence of messages between an external actor and the system during a use case or scenario.
Either a communication diagram or a sequence diagram that shows the interactions between objects
lifeline, or object lifeline
The vertical line under an object on a sequence diagram to show the passage of time for the object
Part of a message between objects that is evaluated prior to transmission to determine whether the message can be sent
A condition during an object's life when it satisfies some criterion, performs some action, or waits for an event
For a particular transition, the state to which an object moves after the completion of a transition
For a particular transition, the original state of an object from which the transition occurs
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