 We can classify theories of intention roughly but usefully on two axes. First, how do they find unity in the guises of intention? Do they explain one in terms of another? Which, if any, do they treat as primary? There is a deep opposition here between accounts that take intention to be a mental state in terms of which we can explain intentional action, and those that do not. Second, how do they understand the relation between intention and evaluative thought, which bears on the possibility of akrasia, and the relation between intention and belief, which bears on the nature and scope of self-knowledge? These questions arise whatever the relation between intending and doing. Sections 1 and 2 address the first axis of disagreement, while sections 3 to 5 primarily address the second.