High-quality information created and shared outside of journals and traditional publishers. Examples include: reports, white papers, dissertations and theses, conference papers, article pre-prints, data and more.
Why use grey literature? It may: be more current, with better coverage of emergent research areas; be a better source of information on policies and programs; be a source of different perspectives than mainstream publications offer; be more detailed than journal articles, with raw data or more extensive context. Grey literature can be hard to find and evaluate.
These resources can be used to get in contact with researchers or to search for unpublished study information.