As defined by the Grey Literature International Steering Committee, grey literature is information "produced on all levels of government, academics, business, and organizations in electronic and print formats not controlled by commercial publishing."

Grey literature is produced by organizations such as government agencies, research institutes, professional associations and think-tanks in the non-traditional means. It is often unpublished, non-commercial and hard to find.

• The kind of information you are looking for. It could include:
  • government reports,
  • conference proceedings,
  • policy documents, etc.
• Organizations who would publish this type of information. They could include:
  • government body,
  • think tanks,
  • academic institution, etc.
• Your parameters. They could include:
  • publication date(s),
  • geographic region(s),
  • language(s), etc.

While news and magazine articles are not strictly grey literature, they can be helpful in providing background information before you start your comprehensive search for grey literature, including relevant organizations, recent developments, etc.