Grey literature (sometimes called "fugitive" literature) is material which is not formally or commercially published.
It is produced by government departments or agencies, international agencies, local authorities, academic institutions, professional or scholarly associations, think tanks, charities, non-profit organisations, companies and other organisations.
It includes, but is not limited to, the following sorts of materials
Grey literature can be hard to trace; details are not usually included in bibliographic databases (with some exceptions). However, the online resources detailed in this guide make it easier to locate than at any time in the past.
Grey literature can be very useful:
However, it is also important to remember that:
Not sure if you can trust grey literature you have found?
The AACODS checklist contains questions designed to help you assess the Authoritym Accuracy, Coverage, Objectivity, Date and Significance of the material.