 If prospective intention cannot be explained in terms of intentional action, or both in terms of being in progress, how can we preserve the unity of our three divisions? In particular, how does intentional action relate to prospective intention and intention-with-which? There are two obvious thoughts. The first is that doing A intentionally is doing it with some further intention, or doing something with the intention of thereby doing A. The second is that both phenomena are to be explained in terms of intention as a mental state. Let us take these possibilities in turn.