The CDS is a set of standards and definitions of data items rather than a survey instrument or set of data represented in a database. Each of the higher education surveys conducted by the participating publishers incorporates items from the CDS as well as unique items proprietary to each publisher. Consequently, the publishers' surveys differ in that they utilize varying numbers of items from the CDS.
http://www.commondataset.org/ (link will open up a new window)
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