... Approach to Discourse Anaphora. Doctoral dissertation, Division of Applied Mathematics, Harvard University. 31 THE REPRESENTATION OF MULTIMODAL USER INTERFACE DIALOGUES USING DISCOURSE PEGS ... collapsing of referential equivalence classes (Discourse Markers, DE's of Janus) with referents or surrogates in some representation of the reference world, and it is by virtue of this mapping ... flawed or incomplete representation of the prior discourse, a possibly flawed or incomplete linguistic representation of the new utterance, and/or a mismatch between KB and discourse. The purpose...