CDISC-Gloss – In the context of the Study Data Tabulation Model (SDTM), a higher-level categorization of the subject-level non-observational domains, which are not classified under the SDTM general observation classes. Examples include trial design domains, relationship domains, etc. [Based on SDTM and SDTM Implementation Guide, www.CDISC.org] See also domain, general observational class.