This study aims to investigate the effectiveness of Scatter /Gather browsing for information retrieval. We conduct a withinsubject study of 24 subjects, in which each user conducts searches on a Scatter/Gather system and a classic web search system, and provides feedback and comments. Eleven out of twenty four subjects consider that Scatter/Gather syste m helps them complete the tasks more effectively as it sorts the results and filters out useless information. We discuss strengths and weaknesses of Scatter/Gather compared to a classic web search interface and examine influences of topic characteristics on Scatter/Gather effectiveness. It is su ggested that topic familiarity and specificity have significantly influences on several categories of user perceived retrieva l effectiveness. The influences appear to be greater with the Scatter/Gather system. We find that viewing time has a moderate positive correlation with relevance and usefulness o f a web page, which are highly correlated to each other.
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