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This article documents a study investigating the specific requirements of a Question Answering System which relies on sentence level document retrieval. We compared 50 TReC factoid queries with the Aquaint document sentences which contain their answers. The main morphological and semantic relations linking query terms to document terms are identified.(More)
We have carried out a comparison of interactive search in a homogenous information retrieval domain using a keyword search engine on the one hand and a concept ontology system on the other. The experimental design was that of the TREC Interactive Track. While the results showed that keyword search was superior on this occasion, we have identified the ideal(More)
We present an experiment in which an information retrieval system using a forest of decision trees was trained using Utgoff's ITI algorithm on two test collections. The system was then compared with a conventional inverted indexing engine and found to give a superior performance. We argue that the method has the potential to be used in real applications(More)