According to Mele (2003: Ch. 10), some formulations of this disappearing agent objection are easily dismissed. Some proponents of this challenge use the terms ‘event-causal order’ and ‘natural order’ interchangeably. This would seem to suggest that, on their view, agency is a supernatural phenomenon­—a view that most contemporary philosophers find hard to take seriously. However, sometimes the challenge is raised in order to motivate alternative agent-causal or volitionist theories of agency, and the main proponents of agent-causal and volitionist theories maintain that their views are compatible with naturalism. They would argue that it is a mistake to presume that the event-causal order exhausts the natural order of things.