Special Purpose Domain

**Semantic type:** Functional Concept

**Definition:** 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. (SDTM and SDTM Implementation Guide, www.CDISC.org)

**Synonyms:** - special purpose domain