 It is unclear how many other forms of normativity must be explained in terms of the qualities of agents in order for a theory to count as agent-based. The two best-known agent-based theorists, Michael Slote and Linda Zagzebski, trace a wide range of normative qualities back to the qualities of agents. For example, Slote defines rightness and wrongness in terms of agents’ motivations: “[A]gent-based virtue ethics … understands rightness in terms of good motivations and wrongness in terms of the having of bad (or insufficiently good) motives” (2001: 14). Similarly, he explains the goodness of an action, the value of eudaimonia, the justice of a law or social institution, and the normativity of practical rationality in terms of the motivational and dispositional qualities of agents (2001: 99–100, 154, 2000). Zagzebski likewise defines right and wrong actions by reference to the emotions, motives, and dispositions of virtuous and vicious agents. For example, “A wrong act = an act that the phronimos characteristically would not do, and he would feel guilty if he did = an act such that it is not the case that he might do it = an act that expresses a vice = an act that is against a requirement of virtue (the virtuous self)” (Zagzebski 2004: 160). Her definitions of duties, good and bad ends, and good and bad states of affairs are similarly grounded in the motivational and dispositional states of exemplary agents (1998, 2004, 2010).