Abstract
A method of using relevance judgements to modify docu ment descriptions has previously been proposed. An experi ment is described which investigates the effect that application of this method, based on one query, has on a second query. The results indicate that approximately half of the second queries have substantially different retrieved document sets when docu ment modification is used. Of these, about half behave better, and half worse, than originally. If the queries are repeated a second time, the proportion showing improved performance increases to 90% and only 3% still give inferior retrieved document sets. The general conclusion is that document mod ification can lead to improved information system perfor mance.
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