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Users of online retrieval systems experience many difficulties, particularly with search tactics. User studies have indicated that searchers use vocabulary incorrectly and do not take full advantage of iteration to improve their queries. To address these problems, an expert system for online search assistance was developed. This prototype augments the searching capabilities of novice users by providing automatic query reformulation to improve the search results, and automatic ranking of thedoi:10.1145/125187.125193 fatcat:ft7zm3z565dx5j2crm2rwnk3x4