Grey literature refers to research and information produced by organisations where publishing is not their primary function.
Includes government reports, policy documents, technical reports, white papers, theses, working papers, conference papers, and data sets
Produced by governments, research institutions, NGOs, industry, and international bodies
Not typically peer reviewed, but often authoritative when from credible organisations
Increasingly available through institutional repositories and open access platforms
There are many advantages in working with grey literature, particular in your research field. Some of these include:
Increase the diversity of literature selected and therefore the comprehensiveness of your review
Timeliness - grey literature has a much quicker publication cycle compared to peer-reviewed literature
Allows you to present a balanced picture of the available evidence
This guide contains all you need to know about grey literature including:
What it is
How to find it
How to evaluate it
Lists of sources
Google advanced is an excellent tool for finding and accessing grey literature. It allows levels of precision in searching that most organisational interfaces cannot provide.
This video provides a great introduction to searching the grey literature using google advanced.