  An account of utterance interpretation in discourse needs to face the issue
of how the discourse context controls the space of interacting preferences.
Assuming a discourse processing architecture that distinguishes the grammar and
pragmatics subsystems in terms of monotonic and nonmonotonic inferences, I will
discuss how independently motivated default preferences interact in the
interpretation of intersentential pronominal anaphora. In the framework of a
general discourse processing model that integrates both the grammar and
pragmatics subsystems, I will propose a fine structure of the preferential
interpretation in pragmatics in terms of defeasible rule interactions. The
pronoun interpretation preferences that serve as the empirical ground draw from
the survey data specifically obtained for the present purpose.
