 Perspectivists tend to defend their position by reference to considerations of rationality. Agents are often in situations in which they don’t know all the relevant facts. And yet, perspectivists say, these agents often do what is reasonable or rational for them to do, given their perspective. If, as seems plausible, one acts rationally when one acts for reasons that make it rational for one to so act, then perspectivism must be right: agents who act in error or ignorance often act rationally and, when they do, they act for reasons they have to do what they do. In short, as perspectivism says, the normative reasons an agent has depend in an important sense on his epistemic perspective, and so an agent can have a normative reason that is a false belief. Similar arguments are articulated in relation to justification (though often questions about rationality and justification are run together). Surely, the argument goes, what an agent is justified in doing depends on whether he has reasons that justify his doing that thing. But, again, there are cases where an agent would surely be justified in doing something even though there are conclusive reasons against doing it; and he would be justified precisely because he doesn’t know about those reasons. For example, the fact that the cake is poisoned is a conclusive reason not to offer it to your guests. But you might be justified in offering it to them, the perspectivist says, if you don’t know about the poison. So considerations about the justification of action also seem to support perspectivism because they show that what reasons you have depends on your perspective.