On First Order Information Exchange Paul Dekker Abstract: On First Order Information Exchange Paul Dekker ILLC / UvA, Department of Philosophy This paper is concerned with the felicitous exchange of first order information. What licenses a speaker to convey open propositions or to utter sentences with pronouns? Although Grice's maxims of quality seem to give an appropriate answer to the question what licenses the felicitous exchange of propositional information, and although first order notions of truth and support have been developed within theories of discourse representation and dynamic interpretation, the question about first order licensing has to our opinion remained unanswered sofar. In this paper we develop a specific formal notion of licensing which satisfies some intuitively plausible principles concerning first order information exchange. Speakers may convey information about subjects which have been introduced in a discourse only if these correspond to subjects they themselves have information about. We will show that the very same principles governing single speaker anaphora also can be used to describe the licensing of so-called `cross-speaker anaphora'.