A widely used, international standard for describing data from the social, behavioral, and economic sciences. Two versions of the standard are currently maintained in parallel:
DDI Codebook (or DDI version 2) is the simpler of the two, and intended for documenting simple survey data for exchange or archiving. Version 2.5 was released in January 2014.
DDI Lifecycle (or DDI version 3) is richer and may be used to document datasets at each stage of their lifecycle from conceptualisation through to publication and reuse. It is modular and extensible. Version 3.2 was published in March 2014.
Both versions are XML-based and defined using XML Schemas. They were developed and are maintained by the DDI Alliance.
A tool to enable the automated transfer of statistical data between programs. The software supports version 3.1 of the specification and will read and write XML schemas and associated delimited data files.
Server-side software for building a data portal, with a particular focus on survey datasets. It uses DDI to provide access to the data at the level of concepts and variables. For an example of it in use, see the SOEPinfo data portal.
The Geodoc metadata editor tool allows users to create, validate, edit and export geospatial metadata records. It also supports the creation and export of metadata records as XML output files compliant with a number of standards, including UK AGMAP 2.1, ISO 19115, FGDC, DDI, and Dublin Core.
Provides members of the scholarly community with access to files associated with scholarly studies for the purpose of replication, for all studies conducted by ISPS-affiliated researchers. ISPS metadata records conform to DDI requirements and include a minimal set of Dublin Core metadata elements.