DDI Lifecycle 3.3 specification available for final public review and comment

In the summer of 2018, DDI Lifecycle version 3.3 was made available for public review. Several important issues were identified as a result of that review. Those issues were thoroughly reviewed and addressed, and are now ready for final review at:


This page includes a link to the package containing the schemas and field level documentation. In addition, there are links to related content: Model documentation, High Level documentation, Implementation Guide, Examples, and a complete 3.2 to 3.3 change log with notes on requirements for transforming from version 3.2 to 3.3.

A brief review period for this revised DDI Lifecycle version 3.3 will take place Friday, January 25 through Friday, February 21, after which the Alliance will vote on the new specification.

Version 3.3 contains additional new coverage for the following:

  • Classification management (based on GSIM/Neuchatel)
  • Non-survey data collection (Measurements)
  • Sampling
  • Weighting
  • Questionnaire Design
  • Support for DDI as a Property Graph (properties on items and references)
  • Quality Statement improvements (useful for Eurostat reporting)

DDI Lifecycle version 3.3 also includes improvements in the types and organization of documentation for the specification. These changes allow for the publication of updates and additions as they occur rather than requiring the reissue of the specification itself. We welcome comments on the coverage and format of this documentation.


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