Abstract

I argue that the norms of assertion are engendered by the function of assertions, and that the function of assertions is, roughly, to facilitate the transmission of information from those who have it to those who need it. Assertions can play this role if they are governed by two norms. One norm is deontic in nature, and specifies the conditions under which a speaker may issue an assertion. I argue that the deontic norm permits A to issue an assertion to B if and only if: (1) doing so would improve B’s epistemic position with regards to the proposition thus conveyed, and (2) the proposition conveyed is justified (for A) in a way, and to a degree, appropriate to the purposes for which B is likely to use it. The other is not deontic; it says what it is for an assertion to be good, qua assertion. This is a truth norm. Assertions ought to be true, in that an assertion is good, qua assertion, when it is true.