1. A system ( 100 ) 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 ( 110 ) for composing a query for identifying the certain data-object; an identification unit ( 120 ) for identifying a candidate data-object of the set of data-objects, based on the query; a presentation unit ( 130 ) for presenting a description of the candidate data-object to a user; a feedback unit ( 140 ) 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 ( 150 ) for updating the query for identifying the certain data-object, based on the user feedback on the discriminating characteristic describing the candidate data-object.