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The suite of DDI Alliance products has been formally recognized as an international standard through the publication of ISO/PAS 25955:2026 -- Learn more
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DDI Lifecycle v3.3

Published: 2020-04-15

Field level documentation

Entry points:

XML Schema: https://ddialliance.org/Specification/DDI-Lifecycle/3.3/XMLSchema/instance.xsd

 Added Coverage

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

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Earlier versions:

 

This version of the DDI Lifecycle specification builds on DDI Lifecycle 3.2, correcting documented bugs, refining some aspects of the specification and adding new functionality to support.