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Systematic searching: Quality assessment

What is quality assessment?

Once the searches have been carried out and the studies selected for inclusion in the review, it is time to assess the quality of the studies. Quality assessment, or the critical appraisal of a study, is the evaluation of an individual study in terms of how well it has been done methodologically.  A number of tools and checklists have been developed for different research designs, and it is also possible to assess the quality of published systematic reviews using tools developed for this purpose. These tools focus on those aspects that may introduce a risk of systematic error, or bias, into studies. Such errors include, for example, errors in the randomization of subjects, or inadequate outcome measurement.

To ensure objectivity in the systematic review, two researchers independently assess the included studies. This is followed by a discussion to reach a consensus on each study. In the event of disagreement on a particular study, a third researcher will help to resolve any conflicts.

There are several quality assessment tools, and links to some of the most commonly used tools are provided below. If you need further information, or help in, e.g. choosing the appropriate tool, please contact the teaching staff. Please note that the library does not provide guidance on quality assessment.

Quality assessment tools

What is bias?

More information on quality assessment


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