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Textual query languages based on Boolean logic are common amongst the search facilities of on-line information repositories. However, there is evidence to suggest that the syntactic and semantic demands of such languages lead to user errors and adversely affect the time that it takes users to form queries. Additionally, users are faced with user interfaces to these repositories which are unresponsive and uninformative, and consequently fail to support effective query refinement. We suggest thatdoi:10.1145/288392.288595 dblp:conf/uist/Jones98 fatcat:zfd7eepymfcotkk3gj6iar4uai