1. An apparatus for responding to a current user command associated with one of a plurality of task/domains, the apparatus comprising: means for storing cumulative feedback data gathered from multiple users during previous operations of the apparatus and segregated in accordance with the plurality of task/domains; means for determining the current task/domain with which the current user command is associated; means for determining a current response to the current user command on the basis of that portion of the stored cumulative feedback data associated with the current task/domain; means for communicating to the user the current response; and means for receiving from the user current feedback data regarding the current response, wherein the current feedback data is added to the cumulative feedback data stored in said storing means and associated with the current task/domain.