Abstract
Experiments were designed and carried out in an attempt to identify some parameters relating to ease of manual searching in library catalogs. A comparison of the difficulty of searching the same file in card form and book form indicated that searching the book catalog generally requires more time. In another experiment, the effect of the similarity of neighboring items in the file to ease of search was examined--a problem which grows as the catalog becomes larger. A definition characterizing degrees of item similarity was proposed, and an experiment based on this definition revealed some consistent patterns of search difficulty. Factors relating to the design of printed list indexes to the card catalog were examined.
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