Ranganathan's Five Laws
Updated 2026-08-15
INTRODUCTION
English translation pending.
CORE DEFINITION
S. R. Ranganathan, an Indian librarian and mathematician, proposed the five laws: books are for use; every reader his or her book; every book its reader; save the time of the reader; and the library is a growing organism. The core claim is that a collection's purpose is use rather than preservation, so every design choice should be judged by whether it connects a specific item with the person who needs it. The qualification is that the laws were written for libraries but generalize to any information service, where matching rather than storage is the point.
SCAFFOLDING EFFECT
Reduce cognitive load
- Use test: judge an information system by whether items actually get used rather than by how much it holds. - Matching duty: check that every resource has a path to the people who need it. - Time budget: measure the cost a user pays to find something and cut that cost.
Anchor fast decisions
Information produces value only when it reaches someone who can act on it, so unused holdings represent cost without benefit. Framing the service as a matching problem redirects effort from acquisition toward discovery, indexing, and retrieval speed. Because the collection keeps growing, the matching machinery must grow with it, which is what the fifth law adds to the other four.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Five_laws_of_library_scienceverified
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