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This article reports on the results of testing two versions of an information product, Usability Testing and Research: one version, an Adobe Acrobat Reader e-book with an index with the locators hyperlinked to the page reference for each entry; the other version, the same e-book without an index, but with the full-text search capabilities provided by Acrobat Reader. We first summarize the current literature regarding human indexing and information retrieval by machine (search engines). We then describe the methodology for testing, the testing results, our conclusions, and implications for future research.
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Index Versus Full-text Search: A Usability Study of User Preference and Performance
http://www.ingentaconnect.com/content/stc/tc/2004/00000051/00000002/art00003
 access restricted (by the publisher) to members/subscribers/customers only
 peer-reviewed
Barnum, Carol M., Earvin Henderson, Al Hood and Rodney Jordan
Technical Communication Online
2004
Abstract: This article reports on the results of testing two versions of an information product, Usability Testing and Research: one version, an Adobe Acrobat Reader e-book with an index with the locators hyperlinked to the page reference for each entry; the other version, the same e-book without an index, but with the full-text search capabilities provided by Acrobat Reader. We first summarize the current literature regarding human indexing and information retrieval by machine (search engines). We then describe the methodology for testing, the testing results, our conclusions, and implications for future research.
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