39. The article of claim 37 , wherein said establishing an association between the at least one linguistic or pragmatic item and the at least one user goal comprises employing at least one model of the user with respect to the domain.
39. The article of claim 37 , wherein said establishing an association between the at least one linguistic or pragmatic item and the at least one user goal comprises employing at least one model of the user with respect to the domain. 40. The article of claim 39 , wherein the operations further comprise conducting discourse transactions with the user, the conducting including: receiving signals from the user through at least one communication channel; and generating signals to the user through at least one communication channel; wherein said establishing an association between the linguistic or pragmatic item and the user goal comprises employing a model of discourse transactions.