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28 ).
We have to be careful not to confuse interaction points with interfaces.
Interfaces and interaction points are different concepts. Unfortunately, the two
terms are often used synonymously. On the other hand, the two terms are not
totally unrelated either, as we will see later on.
UML lets you model interaction points with ports. They had been added to
the modeling language with UML Version 2.0. In the diagram, ports are denoted as
small rectangles on the edge of a class.
Though the concept of a port is new to UML, it hasn ??™ t been invented from
scratch for UML. In fact, the concept roots in a notation and methodology called
ROOM ( Realtime Object-Oriented Modeling ) [42].
ROOM doesn ??™ t depend on UML. The concept was fi rst introduced to UML by
Bran Selic and James Rumbaugh as a profi le by the name of UML-RT in 1999 [39].
The ROOM modeling tool ObjecTime became Rational Rose RT when the fi rm
was taken over by Rational Software. That sealed the end of ROOM as a notation
and tool, but the concepts are still valid today.


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