| DDI Metadata Standard | |
| Long Name: | Data Documentation Initiative Metadata Standard |
| Status: | Production Use |
| Version: | DDI 3.3 |
| Organization: | DDI Alliance |
| Committee: | Scientific Board and Technical Committee |
| Related Standards: | XML |
| Abbreviation: | DDI |
| Domain: | Questionnaires Metadata Standard Statistical survey |
| License: | Creative Commons Attribution 4.0 International |
The Data Documentation Initiative (also known as DDI) is an international standard for describing surveys, questionnaires, statistical data files, and social sciences study-level information. This information is described as metadata by the standard.
Begun in 1995,[1] the effort brings together data professionals from around the world to develop the standard. The DDI specification, most often expressed in XML, provides a format for content, exchange, and preservation of questionnaire and data file information. DDI supports the description, storage, and distribution of social science data, creating an international specification that is machine-actionable and web-friendly.[2]
Version 2 (also called "Codebook") of the DDI standard has been implemented in the Dataverse data repository and the data archives of the Inter-university Consortium for Political and Social Research. The latest version 3.3 (also called "Lifecycle") of the DDI standard was released in 2020.[3]
| Institution[4] | Abbr. | Country | |
|---|---|---|---|
| Aristotle Cloud Services Australia | ACSA | Australia | |
| Australian Bureau of Statistics | ABS | Australia | |
| CIS | Spain | ||
| Colectica | Colectica | US | |
| Cornell University | CISER | US | |
| Danish Data Archive | DDA | Denmark | |
| Data Archiving and Networked Services | DANS | Netherlands | |
| Finnish Social Science Data Archive | |||
| SOEP | Germany | ||
| GESIS – Leibniz Institute for the Social Sciences | GESIS | Germany | |
| Institute for Quantitative Social Science at Harvard University | IQSS | US | |
| IZA | Germany | ||
| ICPSR | US | ||
| MIT | US | ||
| Norwegian Social Science Data Services | NSD | ||
| Open Data Foundation | |||
| Princeton University | US | ||
| Research Data Centre of the German Federal Employment Agency, Institute for Employment Research | IAB | Germany | |
| Roper Center for Public Opinion Research | US | ||
| Stanford University | US | ||
| Survey Research Operations, University of Michigan | US | ||
| Swedish National Data Service | SND | Sweden | |
| Swiss Foundation for Research in Social Sciences | FORS | Swiss | |
| U.S. Bureau of Labor Statistics (Associate Member) | US | ||
| UK Data Archive | UKHLS/BHPS | UK | |
| University of Alberta | Canada | ||
| University of California | UCDATA | US | |
| University of Guelph | Canada | ||
| University of Minnesota, Minnesota Population Center | MPC | US | |
| University of Toronto Scholars Portal | Canada | ||
| University of Washington, Center for Studies in Demography & Ecology | CSDE | US | |
| University of Wisconsin-Madison Institute on Aging | MIDUS | US | |
| World Bank, Development Data Group | DECDG | US |