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SOX supports ASIL decomposition according to ISO26262. An ASIL decomposition can be performed on safety goals and requirements with safety classification.
Safety Goals
The ASIL decomposition of safety goals can be performed in the views "Project Safety Goal", "PSS",
"Model Explorer (Diagrams)" and " Object list".
Prerequisite: The safety level of the safety goal must be defined in ISO26262 (ASIL).
Right-click on a safety goal in order to open the context menu shown below.
Choose Decompose and your desired decomposition level. The context menu shows all possible decompositions. Unless you have already reached the lowest level you can do further compositions. - Outcome: The newly created safety goals will be named with prefixes "A_" and "B_", respectively, and will have new safety and parent safety levels.
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Safety Classified Requirements
The ASIL decomposition of requirements can be performed in the "Hierarchy", "PSS", "Model
Explorer- (Diagrams)" and "Object list" views.
Prerequisite: The requirement must be safety classified.
Right-click on a safety classified requirement.
Choose Decompose and your desired decomposition level. The context menu shows all possible decompositions. Unless you have already reached the lowest level you can do further compositions. - Outcome: The newly created safety goals will be named with prefixes "A_" and "B_", respectively, and will have new safety and parent safety levels.
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SysML Example
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Deleting a Decomposition
Right-click on a decomposed requirement or safety goal.
Choose Decompose > Delete decomposition. - Outcome: A dialog will open, asking you to confirm deletion of the child elements.
Click on Yes. - Outcome: The "Refactoring" dialog will open.
Click on Finish.
Outcome: The decomposition has been deleted.
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Also see: