The term grey literature refers to research that is either unpublished or has been published in non-commercial form. Grey literature usually has not been peer-reviewed. Examples of grey literature can include government reports, policy statements, clinical guidelines, statistics, theses, and dissertations, among others. Grey literature is often an invaluable source of up-to-date research on various topics and can contribute significantly to systematic reviews and large-scale review syntheses.
Why use grey literature?
Grey literature plays a crucial role in providing diverse and up-to-date research information, and its inclusion in systematic reviews and research projects can enhance the comprehensiveness and balance of available evidence.
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