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Systematic Reviews

This guide introduces the process of conducting a systematic review of the literature.

Choosing where to search

The aim of a systematic review it is to find all information available on a particular topic. It is therefore important to widely and thoroughly search published and unpublished research.

There are a number of different sources that can potentially be searched for the literature, including:

  • Databases - It is important to search across a range of databases, as no one database covers all the related literature. It is not acceptable to search one database. The decision regarding which databases to search depends on the topic of the review. The searches in the bibliographic databases need to be comprehensive and reproducible.
    To select relevant databases you should:
    • consult the list of databases in this guide
    • check which databases your supervisor recommends
    • ask advice from a librarian
  • Grey Literature - This is information not controlled by commercial publishing that is produced by organizations, governments and industry. Searching grey literature as part of a systematic review prevents publication bias.
  • Trials - Many clinical trials are unpublished, so when appropriate, it is important to include unpublished and ongoing studies to minimise bias.
  • Hand searching - Hand searching (a manual page-by-page examination) journals and conference proceedings may be relevant to your topic as not all trial reports are included in the bibliographic databases. Trials may not also be easily identified in the database search results when screening the titles and abstracts.
  • Reference lists - It can be fruitful to search the reference lists of relevant existing systematic reviews and meta-analyses, as well as other key identified studies. Using this search method would be done in the preliminary stages to help determine that search results did contain these papers.

Suggested Library Databases

Subject-specific databases

For systematic reviews in the health-related disciplines suggested databases include the following.

Ideas for other relevant databases can be found via LibrarySearch subject categories, or via a relevant subject guide.

Multi-disciplinary databases

Australian-specific databases

Evidenced-Based Practice

Open access databases

Grey literature and Clinical Trials

What is Grey Literature?

Grey literature is material not commercially or conventionally published. It is produced by government, academics, business, and industry, in both print and electronic formats. Examples include:

  • conference papers
  • newspaper articles
  • reports
  • theses
  • fact sheets
  • research in progress
  • government publications
  • statistics


Determining if a thesis has already been completed that is closely related to your topic is recommended.


Conference papers can be published in books, journal articles or abstracts, and many organisations make them available online.

You can refine your search by publication or document type when searching many library databases. Use Google or Google Scholar to search for the name of the conference or organisation.

Government sources


Tools and Directories

Trials Register Databases

News articles

Finding systematic reviews

Systematic reviews may be published in the peer-reviewed journal literature. You can find these reviews using databases and restricting your search to publication type 'systematic review'.

Systematic reviews are also produced by government, NGOs, agencies and academic institutions and made available on websites. These reviews are an example of 'unpublished' (or 'grey') research. To find these reviews, you need to:

  • check the websites of relevant organisations
  • or, using Google Advanced Search, enter search terms for your topic in the top search box ('all these terms') as well as the phrase 'systematic review'. 

Major producers of systematic reviews

The Cochrane Collaboration is a global independent network of health practitioners, researchers, and patient advocates producing systematic reviews of primary research in human health care and health policy. Cochrane reviews are internationally recognised as the highest standard in evidence-based health care. Cochrane reviews are published online in The Cochrane Library.

The Joanna Briggs Institute (JBI) is the international not-for-profit, research and development arm of the School of Translational Science based within the Faculty of Health Sciences at the University of Adelaide, South Australia. JBI collaborates internationally with over 70 entities across the world in producing systematic reviews. JBI reviews are published in the subscription journal JBI Database of Systematic Reviews and Implementation Reports.

​EPPI-Centre is part of the Social Science Research Unit at the Institute of Education, University of London. It conducts systematic reviews across a range of topics and works with a large number of funders. Major areas include: Education and social policy, Health promotion and public health, International health systems and development, and Participative research and policy. Full reviews can be found in the Centre’s online Evidence Library.

The Campbell Collaboration  is an international research network that produces systematic reviews of the effects of social interventions in education, crime and justice, social welfare and international development. Full reports are published online in the Campbell Library.

Acknowledgement to Flinders University Library