We therefore focus on this information fl ow direction.
The information fl ow is a new concept of UML 2. It is in principle a kind of
data fl ow modeling. That ??™ s a technique many had missed in UML 1. The data fl ow
modeling is an integral part of the structured analysis (SA) [8], which is also used
in systems engineering, though it is primarily a software development technique.
However, it wasn ??™ t really fi tting for a purely object-oriented notation like UML to
support techniques from the procedural world. Fortunately the times when the
procedural world and the object-oriented world were enemies and excluded each
other are mostly overcome. Today, proven techniques from the procedural world
are not rejected in object orientation, but further developed and integrated in the
paradigm. 12 The object-oriented concepts from the fi eld of software development
do not play a dominant role in systems engineering. In fact, SysML suppresses
them, in part intentionally. For example, there are no classes and objects in SysML.
Now, take a look at our system context model.
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