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SysML introduces an extension of the UML notation, which facilitates distinguishing
between different things. The control fl ow edge can alternatively be
shown as a dashed arrow. However, whether or not you can use this notation variant
depends on your SysML modeling tool.
7 This diagram is based on the Functional Flow Block Diagram (FFBD) developed by TRW in the
1950s; it represents complex flows in a very simple way. EFFBD diagrams add data flow information
to a flow.
4.8 The Activity Diagram
FIGURE 4-47
Example for use cases.
uc [package] Regulate speed
?«system?»
Car
Regulate
Speed
Driver
258 CHAPTER 4 SysML??”The Systems Modeling Language
4.8.1 Activity Composition (Function Tree)
Formally, activities are special classes or, in SysML lingo, blocks. An object of this
class is a concrete execution. This means that you can also generalize activities
and let them participate in associations. You can use this feature to model a kind
of function tree.
You can invoke actions of other actions from within an activity.


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