The latest release of the DDI Alliance’s Data Documentation Initiative standard, DDI-Lifecycle version 3.2 (DDI), includes the ability to attach quality statements about studies, datasets, and other information objects. The DDI structure is simple but flexible. A quality statement consists of two parts:
Citation of the Quality Standard being used
A collection of Compliance Statements, each containing a reference to a concept and the content of the statement
The concepts referenced by each compliance statement may refer to concepts from a hierarchical concept system.