 In static theories of meaning, such as the trivalent accounts of presupposition discussed above, when a sentence is interpreted in a given context, every expression in that sentence is interpreted relative to that same context. In dynamic theories of meaning, the context is allowed to change as a sentence is interpreted. The earliest and perhaps still clearest motivation for this dynamism is what might be termed the anaphoric asymmetry. The anaphoric asymmetry consists in pronouns across languages being usually resolved to expressions that have already occurred, and only being resolved cataphorically to expressions that occur later in the sentence in quite special configurations. The dynamic explanation for this is that pronouns are resolved to referents via the context, and that the context is updated during processing so that it typically only contains information about things that have already been mentioned. The question might then be asked: how does the processing of anaphora relate to the processing of presuppositions? It turns out that there are remarkably strong parallels between phenomena involving anaphora and presupposition, and this in turn provides a motivation for considering not only anaphora but also presupposition to be an intrinsically dynamic phenomenon. In this section, we will first study the parallels between presupposition and anaphora, seen as a possible motivation for considering context change in analyzing presupposition, and then describe in largely historical terms the sequence of developments that led to contemporary dynamic theories.