We present the results of a study of user's perception of relevance of documents. The aim is to study experimen- tally how users' perception varies depending on the form that retrieved documents are presented. Documents re- trieved in response to a query are presented to users in a variety of ways, from full text to a machine spoken query-biased automatically-generated summary, and the difference in users' perception of relevance is stud- ied. The experimental results suggest that the effective- ness of advanced multimedia Information Retrieval ap- plications may be affected by the low level of users' perception of relevance of retrieved documents.
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