24. The system of claim 20 , wherein the means for establishing an association between the at least one linguistic or pragmatic item and the at least one user goal comprises means for employing at least one model of the user with respect to the domain.
24. The system of claim 20 , wherein the means for establishing an association between the at least one linguistic or pragmatic item and the at least one user goal comprises means for employing at least one model of the user with respect to the domain. 25. The system of claim 24 , further comprising means for maintaining a user profile for supplying default information or bindings; and wherein: the model of the user includes at least one perspective comprising expert, typical-user, clustered-user, personal-user, session, or focus; and defaults are maintained with respect to at least one perspective comprising expert, typical-user, clustered-user, personal-user, session, or focus.