 In this section, we will assume that Frankfurt-style cases are successful in order to consider two prominent compatibilist attempts to construct analyses of the sourcehood condition (though see the entry on  compatibilism  for a more systematic survey of compatibilist theories of free will). The first, and perhaps most popular, compatibilist model is a reasons-responsiveness model. According to this model, an agent’s action \(\phi\) is free just in case the agent or manner in which the action is brought about is responsive to the reasons available to the agent at the time of action. While compatibilists develop this kind of account in different ways, the most detailed proposal is due to John Martin Fischer (1994, 2006, 2010, 2012; Fischer and Ravizza 1998. For similar compatibilist treatments of reasons-responsiveness, see Wolf 1990, Wallace 1994, Haji 1998, Nelkin 2011, McKenna 2013, Vargas 2013, Sartorio 2016). Fischer and Ravizza argue that an agent’s action is free and one for which he is morally responsible only if the mechanism that issued in the action is moderately reasons-responsive (Fischer and Ravizza 1998, ch. 3). By ‘mechanism’, Fischer and Ravizza simply mean “the way the action was brought about” (38). One mechanism they often discuss is practical deliberation. For example, in the case of Jones discussed above, his decision to vote for Clinton on his own was brought about by the process of practical deliberation. What must be true of this process, this mechanism, for it to be moderately reasons-responsive? Fischer and Ravizza maintain that moderate reasons-responsiveness consists in two conditions: reasons-receptivity and reasons-reactivity. A mechanism’s reasons-receptivity depends on the agent’s cognitive capacities, such as being capable of understanding moral reasons and the implications of their actions (69–73). The second condition is more important for us in the present context. A mechanism’s reasons-reactivity depends on how the mechanism would react given different reasons for action. Fischer and Ravizza argue that the kind of reasons-reactivity at stake is weak reasons-reactivity, where this merely requires that there is some possible world in which the laws of nature remain the same, the same mechanism operates, there is a sufficient reason to do otherwise, and the mechanism brings about the alternative action in response to this sufficient reason (73–76). On this analysis, while Jones, due to the activity of Black, lacks the ‘all-in’ sense of the ability to do otherwise, he is nevertheless morally responsible for deciding to vote for Clinton because his action finds its source in Jones’s practical deliberation that is moderately reasons-responsive.