“‘Grey literature’ is used to describe publications not published commercially or indexed by major database vendors. Greylit may be ephemeral (of questionable relevance or quality), but it continues to have an impact in research, teaching and learning. It is occasionally the sole source for specific research questions. While this research may be published eventually, in many cases it is not. Finally, greylit is usually not subject to peer review, and must be scrutinized accordingly. Grey literature may be “fugitive”, hidden, invisible or in the deep web; on government sites, deep in journal archives, institutional repositories, theses databases, conference sites, association publications. Trends in communication are changing the notion of grey literature to include e-mails, faxes, blog postings, wikis, RSS feeds and podcasts.”
