Searching and synthesising ‘grey literature’ and ‘grey information’ in public health: critical reflections on three case studies

Jean Adams, Frances C Hillier-Brown, Helen J Moore, Amelia A Lake, Vera Araujo-Soares, Martin White & Carolyn Summerbell
Abstract Background Grey literature includes a range of documents not controlled by commercial publishing organisations. This means that grey literature can be difficult to search and retrieve for evidence synthesis. Much knowledge and evidence in public health, and other fields, accumulates from innovation in practice. This knowledge may not even be of sufficient formality to meet the definition of grey literature. We term this knowledge ‘grey information’. Grey information may be even harder to search...
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