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There are several recent studies that propose search output clustering as an alternative representation method to ranked output. Users are provided with cluster representations instead of lists of titles and invited to make decisions on groups of documents. This paper discusses the diculties involved in representing clusters for usersÕ evaluation in a concise but easily interpretable form. The discussion is based on ®ndings and user feedback from a user study investigating the eectiveness ofdoi:10.1016/s0306-4573(00)00037-6 fatcat:mxn7v3oh3jgppefqbubgopgwsa