Limits or filters can be used to help you to focus your search. Common limits are criteria such as date range, language, or type of material.
Sometimes you can see limit options when you carry out your search, especially if using an Advanced search. More often, limits are available after you have carried out your search and can be applied to your results.
The type of limits available and how to use them varies - make sure you check the help pages for the resource you're using.
Apply limits one at a time, so you can see the effect they are having on your results. Using too many limits might narrow your results too much.
Limits can be an effective way to focus your search but there are some cases where you should be careful.
Limiting your results to those only published in a particular language is likely to exclude relevant papers and therefore bias your results.
In many databases you can filter or limit by language. However you should consider the wealth of research produced worldwide and available in all languages. It is especially important to avoid this type of bias if you are carrying out a systematic review.
Several online tools are available which can translate blocks of text.