TIP: SysMLv1: Cameo Systems Modeler: HOWTO show Probability on ActivityEdges. (And a String, not a ValueSpecification, is used for the 'probability' of Probability).

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Note kind
MODELLING
TIP
TOOL
Policy level
INFORMATIVE
Specification keywords
SysML-1.6
SysML-1.7
UML keywords
ActivityEdge
tagged value
Stereotype
ValueSpecification
SysMLv1.x keywords
Probability
Probability::probability
Keywords
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SysMLv1: 'When the «probability» stereotype is applied to edges coming out of decision nodes and object nodes, it provides an expression for the probability that the edge will be traversed. These shall be between zero and one inclusive, and add up to one ... '
Some minor GOTCHAs to keep in mind when using SysMLv1 Probability with Magic Cyber-Systems Engineer® (Cameo Systems Modeler®):

No stereotype keyword is shown for Probability (and even if you try to show one using Show Stereotypes). It's deliberately hidden (in fact not defined as a keyword on the Stereotype), and you won't see a «probability» keyword shown in any of the SysMLv1 spec figures either.

Nothing will show until you assign a tagged value for 'probability'. Make sure you have Show Tagged Values active!

The SysMLv1.7 beta spec prescribes a ValueSpecification for 'probability' but Cameo uses a String.
The validation engine does not check whether the probabilities add up to 1 over the edges.

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  [SysML-1.6] When the «probability» stereotype is applied to edges coming out of decision nodes and object nodes, it provides an expression for the probability that the edge will be traversed. These shall be between zero and one inclusive, and add up to one ...
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