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1. Select variables for the domain from the SDTM. Selection of variables must align with SDTM Usage Restrictions.The general approach for adding variables to a domain from the SDTM is to:
   1. Include applicable Identifier variables.
   2. Include applicable Qualifier variables in alignment with the SDTM General Observation Classes.
   3. Include applicable Timing variables.
   4. Apply the domain code to the variables as appropriate by replacing all variable prefixes (shown in the SDTM as “--“) with the domain code.
   5. Set the order of variables consistent with the order defined in the SDTM.
   6. Adjust the labels of the variables only as appropriate to convey their meaning in the context of the data in domain. Use title case for all labels.

   7. Ensure that appropriate standard variables are being properly applied by comparing their use in the domain to their use in related TIG domains.

2. Place any non-SDTM variables nonstandard variables (NSVs) in a Supplemental Qualifier dataset when variables cannot be selected from the SDTM. 

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