Arm

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An Arm element provides the declaration of a study arm. Arms do not have any ordering relative to one another.

When different arms have different workflows, each of them will reference a different WorkflowDef element under MetaDataVersion.
In case all arms have the same workflow (such as often in a blinded study), a single WorkflowDef element under MetaDataVersion can describe the workflow that is common to all arms. In such a case every arm will reference the same workflow.

A CDISC SDTM Trial Design "Element" (the basic building block in the SDTM trial design) will be represented by a referenced StudyEventGroup from the Arm Workflow.