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Abstract

The invention relates to a system () for identifying a certain data-object of a set of data-objects, wherein each data-object of the set of data-objects is described by a plurality of discriminating characteristics, the system comprising: a composition unit () for composing a query for identifying the certain data-object; an identification unit () for identifying a candidate data-object of the set of data-objects, based on the query; a presentation unit () for presenting a description of the candidate data-object to a user; a feedback unit () for receiving user feedback on a discriminating characteristic of the plurality of discriminating characteristics, the discriminating characteristic describing the candidate data-object; and an update unit () for updating the query for identifying the certain data-object, based on the user feedback on the discriminating characteristic describing the candidate data-object. Thus, the user may evaluate a discriminating characteristic of the candidate data-object, based on information obtained from the presentation unit, and provide user feedback comprising a reason specifying why the retrieved data is relevant and/or not relevant to the query.