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This paper presents a study investigating the effects of collaboration and task types on users' query behavior. The study involves two conditions: collaborative search and individual search, and the two search tasks: the recall\u2010oriented information\u2010gathering and the utility\u2010based decision\u2010making. We analyze users' query behavior in three dimensions: basic query features (e.g. the number of queries), query reformulation patterns (e.g. New, Specification, Generalization and Reconstruction) and query performance. The findings of this study reveal that queries are more diverse in collaborative search and recall\u2010oriented tasks. Users employed New and Specialization more often as query reformulation types in collaborative search while people in individual search use Reconstruction more often. Besides, the successful query rate is higher in individual search and recall\u2010oriented tasks.<\/jats:p>","DOI":"10.1002\/meet.14505001091","type":"journal-article","created":{"date-parts":[[2014,5,8]],"date-time":"2014-05-08T16:35:28Z","timestamp":1399566928000},"page":"1-10","source":"Crossref","is-referenced-by-count":8,"title":["An investigation of the query behavior in task\u2010based collaborative exploratory Web search"],"prefix":"10.1002","volume":"50","author":[{"given":"Zhen","family":"Yue","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuguang","family":"Han","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daqing","family":"He","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2014,5,8]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/asi.4630300406"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/meet.14504901181"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/aris.1440400115"},{"key":"e_1_2_8_5_1","unstructured":"Golovchinsky G. 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