An apparatus for responding to a current user command associated with one of a plurality of task/domains includes: a digital storage device that stores cumulative feedback data gathered from multiple users during previous operations of the apparatus and segregated in accordance with the plurality of task/domains; a first digital logic device that determines the current task/domain with which the current user command is associated; a second digital logic device that determines 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; a first communication interface that communicates to the user the current response; and a second communication interface that receives from the user current feedback data regarding the current response. The current feedback data is added to the cumulative feedback data stored in the digital storage device and associated with the current task/domain.