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Products
Show submenu for Products
Choosing a DDI Product
DDI Common Core (ISO/PAS 25955:2026)
DDI-Codebook (DDI-C)
DDI-Lifecycle (DDI-L)
DDI-Cross-Domain Integration (DDI-CDI)
Extended Knowledge Organization System (XKOS)
Structured Data Transformation Language (SDTL)
Use Cases
Show submenu for Use Cases
Use Case by Role
Codebook
Lifecycle
Question Bank
Questionnaires
Data Catalog
Longitudinal Data
Computer Aided Interviewing System Output
Data in Excel
Compare Variables
Resources
Show submenu for Resources
Training Materials
Controlled Vocabularies
Glossary
Markup Examples
Tools
Relationships to Other Standards
DDI Agency Registry
DDI Metadata Profiles
Events & Publications
Show submenu for Events & Publications
Annual Meetings of the DDI Alliance
Conferences
Workshops & Webinars
Events at Dagstuhl
Publications & Presentations
Newsletters
Working Paper Series
News
Membership
Show submenu for Membership
How to Join the DDI Alliance
Membership List
Working Groups & Committees
About
Show submenu for About
Our Mission
Leadership
DDI ISO Standard (ISO/PAS 25955)
Partners
History of DDI
Promotional Materials
Funding Guidelines and Request Form
Subscribe to DDI Mailing Lists
The suite of DDI Alliance products has been formally recognized as an international standard through the publication of ISO/PAS 25955:2026 --
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