In 2001 the INCOSE decided to make UML a standard language for systems
engineering. UML essentially meets the requirements, it is widely used, it can be
adapted to specifi c needs, and there are a large number of modeling tools as well
as consulting and seminar vendors. Thanks to the extension mechanism (stereotypes)
new modeling vocabulary can be defi ned, so that UML can be adapted to
specifi c domains and disciplines. Together with UML Version 2.0 6
the range of
applications has further increased versus UML 1 (see, e.g., [33]).
The adaptation of UML for systems engineering has the name OMG Systems
Modeling Language (OMG SysML?„?), and its Version 1.0 is based on UML 2.1.1.
The most important extensions are:
?– UML classes are called blocks in SysML, and the class diagram is called block
defi nition diagram . The UML composite structure diagram is called internal
block diagram in SysML.
?– Item fl ows in the internal block diagram. For both diagrams several extensions
were defi ned.
?– Support of Enhanced Functional Flow Block Diagrams ( EFFBD ) and continuous
functions by action and object nodes in the activity diagram.
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