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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.

Use Case Diagram

A diagram to show the various user roles and how those roles use the system.

System Sequence Diagram (SSD)

A diagram showing the sequence of messages between an external actor and the system during a use case or scenario.


The communication between objects within a use case.

Domain Model

A model that describes classes of objects and their states.

State Machine Diagram

A diagram showing the life of an object in states and transitions.


A symbol used to denote a group of similar elements.

Interaction Diagram

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

True/False Condition

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


The movement of an object from one state to another state


The starting point of a state machine diagram indicated by a black dot

Destination State

For a particular transition, the state to which an object moves after the completion of a transition

Origin State

For a particular transition, the original state of an object from which the transition occurs

Message event

The trigger for a transition, which causes the object to leave the origin state


A true/false test to see whether a transition can fire.


A description of the activities performed as part of a transition

Concurrency, or concurrent state

The condition of being in more than one state at a time


A sequential set of a connected states and transitions

Composite State

A state containing other states and transitions [that is, a path]

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