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Title: Expandable indexes vs. sequential menus for searching hierarchies on the world wide web
Authors: Zaphiris, Panayiotis 
Shneiderman, Ben
Norman, Kent L.
Issue Date: 2002
Publisher: Taylor & Francis Group
Source: Behaviour and Information Technology, 2002, Volume 21, Issue 3, Pages 201-207
Abstract: An experiment is reported that compared expandable indexes providing full menu context with sequential menus providing only partial context. Menu depth was varied using hierarchies of two, three and four levels deep in an asymmetric structure of 457 root level items. Menus were presented on the World Wide Web within a browser. Participants searched for specific targets. Results suggest that reducing the depth of hierarchies improves performance in terms of speed and search efficiency. Surprisingly, expandable indexes resulted in poorer performance with deeper hierarchies than did sequential menus.
ISSN: 0144-929X
DOI: 10.1080/0144929021000009045
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