 For Kaplan, a context is a quadruple of an agent, location, time and world; intuitively, these are the speaker of an utterance, the time and location of the utterance, and the possible world in which it occurs; the beliefs of the speaker as to who she is, where she is, and when it is, and what the real world is like are irrelevant to determining content, although not of course to explaining why the speaker says what she does. (The possible world is the contextual feature Kaplan uses to deal with “actually”). A proper context is one in which the agent is at the location at the time in the world, which is of course the characteristic relation among the speaker, time, location and world of an utterance.