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286 Selected Studies on Software and Information Systems
− Different actions with search results, such as bookmarking, adding to the shopping
cart or rating.
Figure 10-11. The navigation process in a simple faceted browser.
Figure 10-12 shows an example graphical user interface of our faceted browser Factic in the
domain of job offers. As such, it is a faceted browser employing primary and secondary
facets with multilevel content. It supports both nominal and ordinal facet values – enumerations
and intervals respectively (Adkisson, 2005).
Individual facets for the type of the offered position, location, industry sector, start
date, job term and contract type are shown on the left. The current query is shown at the
top, while the results of its evaluation are displayed in the center. For each search result,
the title of the job offer and its main attributes are shown. Additional operations with results
include their sorting, rating and optionally editing.
10.6 Navigation Visualization and Content Presentation
The visualization and presentation aspect of web-based applications plays a major role in
their success and user acceptance. This concerns the overall layout and graphical design of
applications, the use of color, styles, fonts etc., which have a major impact on whether users
will like or hate an application. Much can be accomplished by following “tried and
true” usability guidelines (Nielsen, 2007) and taking advantage of research performed by
the HCI community.
In our work however, we do not focus on the design of specific user interfaces, but rather
on their conceptual functionality and behind the scenes processing with relation to
navigation, user understanding and personalization of information with respect to large
open information spaces.
From the navigation perspective it is important to understand how links are visualized
and how the users interact with them. “Classical” navigation used only simple links,
which were placed at specific locations in the presented document, whose visualization