Document, Discover and Interoperate
The Data Documentation Initiative (DDI) is an international standard for describing the data produced by surveys and other observational methods in the social, behavioral, economic, and health sciences. DDI is a free standard that can document and manage different stages in the research data lifecycle, such as conceptualization, collection, processing, distribution, discovery, and archiving. Documenting data with DDI facilitates understanding, interpretation, and use -- by people, software systems, and computer networks.
Why Use DDI?
- Generate interactive codebooks
- Implement data catalogs
- Build question banks
- Create concordance mappings
- Harmonize and compare data
- Manage longitudinal data sets
Featured DDI Adopters
Center for Hispanic Americans Research Methods (CHARM)
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CESSDA Data Catalogue
The Consortium of European Social Science Data Archives (CESSDA) offers a data catalogue providing access to research data from archives across Europe. The catalogue includes nearly 30,000 studies (~22,000 with english descriptions) distributed by members of the CESSDA European Research... read more
CLOSER
The CLOSER (Cohort and Longitudinal Studies Enhancement Resources) programme aims to maximise the use, value and impact of the member UK longitudinal studies. A key part of the CLOSER project is the creation of a Uniform Search Platform allowing users to search the metadata from all of the projects... read more
ICPSR Data Catalog
An international consortium of more than 750 academic institutions and research organizations, Inter-university Consortium for Political and Social Research (ICPSR) provides leadership and training in data access, curation, and methods of analysis for the social science research community. ICPSR... read more
International Household Survey Network (IHSN)
The IHSN program of activities includes: Improvement of data collection methods and practices through assessment and improvement of survey methods and programs. The IHSN facilitates the work of experts and specialized task forces who produce guidelines and reference materials. The IHSN also... read more
Mid-Life in the United States (MIDUS)
Midlife in the United States (MIDUS) is a national longitudinal study of health and well-being. It was conceived by a multidisciplinary team of scholars interested in understanding aging as an integrated bio-psycho-social process. Since its inception in 1995 MIDUS has continued to grow, such that... read more
The Dataverse Project
The Dataverse Project is a community and an open source web application to share, preserve, cite, explore and analyze research data. It facilitates making data available to others, and allows you to replicate others work. Researchers, data authors, publishers, data distributors, and... read more
