Welcome to a special double issue of the IASSIST Quarterly featuring articles focused on the Data Documentation Initiative (DDI), a metadata standard for the social sciences. We are proud to present these six articles, which explore various projects related to DDI 3 and its enhanced features. The articles draw on previous presentations and papers created in connection with the 2009 "Expert Workshop on Implementation of DDI3 -- Advanced Topics" held in Wadern, Germany; the 2009 European DDI Users Group (EDDI) meeting held in Bonn, Germany; and the IASSIST conferences held in Tampere, Finland (2009) and Ithaca, New York, USA (2010).
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