currency - The quality of being in progress, recent, or up-to-date. In information retrieval, the extent to which the content of a document or source reflects the existing state of knowledge about the subject. In the research process , the importance of currency varies, depending on the discipline. In medicine and the sciences, information can become outdated in less than five years, but in the arts and humanities, materials decades old may be just as useful as more recent information. ;
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http://vax.wcsu.edu/library/odlis.html#dvd;
