SDTM describes several types of datasets. This diagram illustrates a hierarchical view of those types of datasets.
![](/sites/default/files/kb/Diagram_Structures.png)
Findings domains may be represented as findings about a study subject or about an associated person. A findings domain record can be linked to supplemental qualifiers, to comments, or to other records via relationships represented in RELREC.
![](/sites/default/files/kb/Finding%20and%20associated%20records.png)
Substance administrations or other treatments or procedures represented in an Interventions domain may be administered to a subject or an associated person. An intervention record can be linked to findings about the intervention, to supplemental qualifiers, to comments, or to other records via relationships represented in RELREC.
![](/sites/default/files/kb/Diagram_Structures_3.png)
Occurrences represented in Events domains may happen to a subject or an associated person. An event record can be linked to findings about the event, to supplemental qualifiers, to comments, or to other records via relationships represented in RELREC.
![](/sites/default/files/kb/Diagram_Structures_4.png)