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There are many definitions on Grey Literature:
Grey literature usually pertains to any research material that has not been commercially published, or which have not gone through a peer review process. It is usually described as being the opposite to black literature publications, which is usually found in commercial bibliographic databases. The Fourth International Conference on Grey Literature (GL '99) which was held in Washington, DC, in October 1999 defined grey literature as follows: ""That which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers." https://www.greylit.org/about
Types of grey literature or grey information resources can be found in a myriad of formats and in very broad settings. Some examples are government reports and conference proceedings. Further examples can be found under Types of Grey literature tab.
It is important to understand the value grey information can add to your research. Grey information can be of high value and pertain good "levels of evidence". Often it contains the best up to date information in your area of research or expertise. It adds strength to a robust research process where both grey information resouces as well as black literature (peer-reviewed resources found in commercial databases) are persued in the research process. This overall point of direction leads to less bias in publishing as well as finding all of the useful resources for your research question.
Grey literature is:
One of the first more robust definitions stemms from the Luxembourg definition at the Third International Conference on Grey Literature in 1997:
This definition was updated, 2004 at the 6th International Conference in New York to finally arrive at the Prague definition 2010
("Prague definition") with four new essential attributes: "Grey literature stands for manifold document types produced on all levels of government, academics, business and industry in print and electronic formats that are protected by intellectual property rights, of sufficient quality to be collected and preserved by library holdings or institutional repositories, but not controlled by commercial publishers i.e., where publishing is not the primary activity of the producing body") Towards a Prague Definition of Grey Literature, Author :Schopfel, Joachim (University of Lille) ; 2020
|Conference papers||Blogs||Government documents|
|Research reports||Bulletin boards||Trade magazines|
|Policy statements||Catalogues||Repair materials|
|Business documents||Press release||E-prints|
|Working papers||Interviews||White papers|
@Jess Tyndall, Flinders University, 2008. How low can you go? Towards a hierachy of grey literature.
Anna Lovang, Senior Research Librarian
Carl de Gruchy Library, St.Vincent's Hospital Melbourne
41 Victoria Pde, Fitzroy, VIC 3065
(Literature searching, Education tutorials & Consultations, Nursing liaison)