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The user's understanding of information needs and the information available in the data collection can evolve during an exploratory search session. Search systems tailored for well-defined narrow search tasks may be suboptimal for exploratory search where the user can sequentially refine the expressions of her information needs and explore alternative search directions. A major challenge for exploratory search systems design is how to support such behavior and expose the user to relevant yetdoi:10.1145/2678025.2701401 dblp:conf/iui/AndolinaKPHRCKG15 fatcat:srqq3eim6zg63asvh7fbvpe2a4