Using additional search techniques, such as citation searching, as appropriateĬontinuous review of how best to find evidence and where.Ī flexible approach will allow evidence to be identified both systematically and in the most efficient manner. Selecting appropriate sources according to the eligibility or inclusion criteria of the review question, as specified in the review protocol Tailoring the search approach to the eligibility or inclusion criteria of the review question, as specified in the review protocol When the guideline is an update, the approach can also be informed by searches for the existing guideline and subsequent surveillance review. If review questions are so broad that the information specialist has to restrict the searches to complete the review in the time available, this should be acknowledged as a limitation in the final review document.Ī flexible approach to the search for evidence should be adopted, guided by the subject of the question and type of evidence sought. The aim is to identify the best available evidence to address a particular question without producing an unmanageable volume of results. NICE encourages the use of search methods that balance recall and precision. For information on searching for surveillance evidence, see the chapter on ensuring that published guidelines are current and accurate. For information on searching for economic evidence, see the chapter on incorporating economic evaluation. The methods for undertaking scoping searches are described in the chapter on the scope. These include quality assurance, re‑running searches, documenting the search process, and the use of reference management or systematic review software. It also provides advice on other areas of information management that form an important part of guideline development. This chapter provides advice on the sources to search and on how to develop strategies for systematic literature searches to identify the best available evidence. These may affect the results of reviews and include publication bias and database bias. Literature searches should be systematic, transparent and reproducible to minimise 'dissemination biases'. The systematic identification of evidence is an essential step in developing NICE guidelines.
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