 Suppose, for example, we are talking about Albert. The common ground will include such things as that ‘Albert’ names a certain person that attended Stanford last year, that this person was from Bonn, and that he intended to return and teach in Germany. The common ground leaves open whether he is, as we speak, in Germany or not. I say, “Albert isn’t in Germany, but in Switzerland, this month.” If no one objects, the common ground will change; the worlds in which Albert is anywhere but in Switzerland will be eliminated. The propositional concept of an utterance can be seen as the effect it will have on the various contexts in which it might occur. Which worlds my assertion adds or deletes from the common ground will depend on who we are talking about (the reference of ‘Albert’) and which month it is when I speak, for example. The proposition expressed by a statement, what is asserted, will be a proposition that captures the change proposed for the context in which it occurs.