Grey Literature is material that has NOT been published by commercial publishers. This includes working papers, reports, policy briefs, blogs and dissertations.
Grey literature can have the advantages of immediacy and/or divergent points of view, however, all grey literature should be very carefully scrutinized and evaluated.
Gildo Insfran, Carlos Reutemann, Adolfo Rodríguez Saá, Néstor Kirchner, and other Argentine governors in a crisis meeting headed by Presidential Chief of Staff Chrystian Colombo (25 July 2001). By Marianopaez31 via Wikimedia Commons.
NGOs, non-governmental organizations, are often created to address specific issues or give a voice to particular groups of people.