Why might a researcher use filters when searching literature?

• A. To narrow results to the most relevant primary sources.
• B. To increase the number of irrelevant results.
• C. To hide abstracts.
• D. To slow down the search.

Answer: (A)

Filters in literature searches help you target relevant sources by narrowing the result set. They let you constrain results by criteria such as document type, publication date, language, and study design, so you can focus on the most relevant primary sources—original research articles that report methods and data. This is valuable when you need to assess evidence directly, replicate analyses, or build a foundation for your own work. By prioritizing primary sources, you avoid sifting through reviews or secondary summaries that may synthesize or reinterpret data. Filters don’t aim to increase irrelevant results or hide abstracts, and while applying filters adds some processing, it typically speeds up the overall process by reducing what you have to screen.