Quality Statements

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.