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University Library, University of Illinois at Urbana-Champaign

Systematic Reviews

Preliminary Search

  • Do a quick search to assess breadth and depth of research related to topic or issue
    • find relevant reviews
    • determine number of potential studies
  • Use these results to refine scope of the search and criteria

Comprehensive Database Search

Identifies all published and gray literature that satisfy search criteria

  • Databases
  • Trial Registries


Gray Literature

  • conference proceedings
  • posters and poster abstracts
  • presented papers/abstracts


  • Associations & Professional Organizations
  • Bibliographies

for more information:  Gray Literature in Health and Biomedicine