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Flows can run in parallel, or they can be synchronized,
or split based on conditions.
More simply, the model shows what will be done in which sequence, which
data all of this requires, and which data will be output. The activity model of UML
2 is extended by several properties in SysML:
?–  Extended control fl ow with additional information to stop actions or control
the fl ow via so-called control operators.
?–  Support for modeling of continuous systems.
??“ Continuous or discrete object fl ow.
??“ Object nodes can reject data that are no longer current.
?–  Probabilities of fl ows.
?–  Modeling rules for activities in the form of a block defi nition diagram (function
trees).
The activity model of SysML is compatible with the EFFBD popularly used in
systems engineering. 7 SysML defi nes an activity stereotype, ?«effbd?» , which dictates
a few constraints in order to maintain compatibility. For example, such an activity
must not have partitions, because they cannot be mapped in EFFBD. You fi nd a
complete list of constraints in [44].


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