Editing Five laws of library science (section)

===Fourth Law: Save the time of the reader===
The fourth law of library science, "Save the time of the reader," means that all patrons should be able to easily locate the materials they desire quickly and efficiently. The practice of librarianship creates systems, services, workflows, guides and frameworks to the benefit of practicality to the user.<ref>{{cite book|last=Hudson|first=David James|chapter=The Whiteness of Practicality|title=Topographies of Whiteness: Mapping Whiteness in Library and Information Studies|editor-last=Schlesselman-Tarango|editor-first=Gina|pages=203–234|date=2017|location=Sacramento|publisher=Library Juice Press|url=https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11619|access-date=28 April 2022}}</ref> Ranganathan said the fourth law in turn saves the time of the library staff through such practices as centralized [[classification]] and [[Cataloging (library science)|cataloging]], documenting materials before sending them to the library that ordered them, and mechanizing methods for information retrieval.{{sfn|Ranganathan|1957|p=29-30}}