What is Grey Literature?
Grey literature is defined as: "Information produced on all levels of government, academia, business and industry in electronic and print formats not controlled by commercial publishing i.e. where publishing is not the primary activity of the producing body." (ICGL Luxembourg definition, 1997-Expanded ind New York, 2004). Grey literature is not indexed by major databases or published commercially. Some may be of questionable quality, but may sometimes be the only source for specific research questions. Some grey literature is not subject to peer review. It may be "fugitive" (i.e. lasting only a short time), hidden, invisible or in the deep web (i.e. on government sites, deep in journal archives, institutional repositories, theses databases, conference sites or association publications). Some examples of grey literature include theses and dissertations, newsletters, conference proceedings and abstracts, research reports, annual reports, standards, technical specifications.