|Grey Literature is any kind of literature that has not been published through traditional publishing means. It is literature that is not usually found in academic research databases or in other mainstream sources. It is produced by organizations such as government and inter-governmental agencies, by non-governmental organizations (NGOs), by industry, business, and academia.|
Academics and researchers tend to put most trust in information that has gone through the peer-review process. This kind of literature is often referred to as "black literature". The term "grey literature" comes from the nebulous status of the information.
Grey literature includes:
Also, see here for a long list of what is considered grey literature!
** Grey literature does not go through the peer-review process, so always make sure to critically evaluate any grey lit source you use.
Why should you search for Grey Literature and include it in your research?