Token fl ow [UML] : A fl ow that uses control tokens and object tokens to describe the
fl ow of an activity.
Tool [other] : A software application designed to support the development process (e.g., a
modeling tool).
Trace [UML] : A relationship between two model elements, describing a general context.
293 Glossary
Transition [UML] : A transition specifi es the passing from one state into another. It is a directed
relationship between two states. It defi nes a trigger and a condition that both cause the state
transition and behavior that is executed during that transition.
Trigger [UML] : A trigger connects exactly one event with a behavior.
Type [UML] : A type defi nes a value range (e.g., a primitive data type or a block).
U
UML [UML] : The Unifi ed Modeling Language (UML) is a graphical modeling language used to
describe software and other systems.
UML tool [other] : Modeling tool.
Unit [SysML] : A unit describes the structure of a physical unit (e.g., kilogram, meter).
Use case [UML] : A use case describes a temporally related and targeted interaction between an
actor and a system.
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