In conversation, a person sometimes has to refer to an object that is not
previously known to the other participant. We present a plan-based model of how
agents collaborate on reference of this sort. In making a reference, an agent
uses the most salient attributes of the referent. In understanding a reference,
an agent determines his confidence in its adequacy as a means of identifying
the referent. To collaborate, the agents use judgment, suggestion, and
elaboration moves to refashion an inadequate referring expression.Comment: 6 pages, to appear in proceedings of COLING-94, LaTeX (now uses
fullname.sty, fullname.bst