Given a user query, search engines generally return a very sizeable collection of possible answers. Clustering has been proposed as a tool to partition the possible answer set into more manageable subsets of related results. There is no current agreement on the preferred mode of presentation of these clusters. Currently, most search engines display the set of results in an almost purely textual form. However, relatively recently we have witnessed some timid attempts to use some graphical representations. To elucidate when and why text appears to outperform graphics for certain fundamental clustering related tasks, this work presents a preliminary user study with three interfaces to display flat clusters of user queries.
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