Exploratory search systems (ESS) are designed to help users move beyond simply finding information toward using that information to support learning, analysis, and decision-making. The evaluation of the interactive systems designed specifically to help exploratory searchers is a challenging area, worthy of further discussion in the research community. In this article we report on a workshop conducted in conjunction with the ACM SIGIR Conference in Seattle, USA, in August 2006. The workshop involved researchers, academics, and practitioners discussing the formative and summative evaluation of ESS.
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