 Another is the project of arguing that agents’ abilities are, or are not, compatible with the possibility of determinism. This is a question we touched on briefly in Section 5.1. As noted there, the new dispositionalists are motivated, in part, by the project of arguing for compatibilism. In contrast, Steward is explicitly concerned to defend incompatibilism. (Vetter appears to be neutral on this question.) The question of how the analysis of ability bears on the free will debates looms over many of these discussions, and we will confront it directly and at some length below in Section 6.