In response to the growing volume of health care literature and the variable quality of reported studies, systematic reviews have increasingly been used to guide health care decisions because of their rigorous summary of the research. Systematic reviews utilise planned methods of identifying, appraising, then summarising the results from individual studies. The steps in performing a systematic review include: preparing a detailed research protocol; selecting criteria for inclusion of articles in the review; systematically searching the published and unpublished literature; determining which articles meet the predefined inclusion criteria; critically appraising the quality of the research; extracting outcome data from the research report and statistically combining data, where appropriate, in order to summarise the best available evidence on the topic of interest. These processes are documented in the systematic review report, and can be subject to peer review and critique like other research.