Public Health: Defining Grey Literature

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Guidance Documents for Searching Grey Literature

  • Grey Matters: A Practical Search Tool for Evidence-Based Medicine This online manual provides a thorough list of sources for grey literature in medicine and a helpful checklist to help systematize your process.

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Defining Grey Literature (and Search Strategies)

What is grey literature?   Grey (or gray) literature is defined by the  Cochrane Handbook for Systematic Reviews of Interventions  as "...literature that is not formally published in sources such as books or journal articles." This can include information such as government reports, conference proceedings, graduate dissertations, unpublished clinical trials, and much more.  Additional information can be found on the " Select Grey Literature Sources " page of the Cornell University Library's Guide to Evidence Synthesis LibGuide .

Why search the grey literature if it hasn't been peer-reviewed?   There is a strong bias in scientific publishing toward publishing studies that show some sort of significant effect.  Meanwhile, many studies and trials that show no effect end up going unpublished.  But knowing that an intervention had no effect is just as important as knowing that it did have an effect when it comes to making decisions for practice and policy-making.  Thus, the grey literature can be critical.

How do I search the grey literature if it's unpublished and not in the scholarly databases?    It's true, finding grey literature and searching it systematically is challenging.  But there are a few approaches that you can take to add some structure to your search of this type of information:

  • Identify and record  the sources you will search, including listing search terms used if appropriate.  The sources you search will be informed by your research question and where you expect to find information related to your question.
  • Try searching  databases that specialize in grey literature .  See this LibGuide's page on Key Sources and Databases for Gray Literature   for more information.
  • Conference proceedings :  Identify professional organizations that have conferences at which researchers might be presenting work related to your topic.  Search those conference proceedings on the organization's website or by contacting organizational boards for access to past proceedings that may not be online.
  • Theses and dissertations :  There are a number of databases dedicated to theses and dissertations, which you can search using your search terms.  See the box below for links to these resources. 
  • Identify government agencies, and international and non-governmental organizations , that might publish technical papers and reports on your topic.  Search their websites or any online libraries that they may provide.  For example, the  World Health Organization (WHO)  has a number of searchable online collections and the  World Bank  now makes all of their publications openly available online.
  • Contact known researchers  in the field to determine if they are aware of any relevant ongoing or unpublished studies.
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  • Last Updated: Jul 17, 2024 1:48 PM
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