The question of asymmetryTo ask what is special about self-knowledge is to ask how self-knowledge is different from other kinds of knowledge. More specifically, it is to ask how self-knowledge differs from our knowledge of the minds of other people. This is the topic of this issue. There are at least two possible motivations for focussing on the asymmetries between these two forms of knowledge. One might, for instance, be interested in epistemology generally, and knowledge of mental states specifically, and be drawn into the debate of self-knowledge to get clearer on the different (or similar) ways in which beliefs, desires, emotions, pains and so on can be known by a subject. To take this route is to have an intrinsic interest in some of the special features of self-knowledge. Consider, for instance, Christopher Peacocke (1998), who begins an article on the topic by asking what is involved in the consciousness of an occurrent propositional attitude, and goes on to say: "I hope the intrinsic interest of these questions provides sufficient motivation to allow me to start by addressing them" (1998, 63). Alternatively, one might want to explore self-knowledge in order to get a better understanding of some of our prudential and/or moral practices and concerns. Self-knowledge, on this view, is not interesting in and of itself, but rather deserves our interest because of something else (Cassam 2014).At first blush, philosophers in the debate on self-knowledge, whatever their motivation, all seem interested in the same phenomenon, and hence appear to address the very same question, formulated in different ways. And in a sense they do, in so far as the question is a general one of what distinguishes self-knowledge from other kinds of knowledge. We might call this "the question of asymmetry".We can learn a great deal from seeing these philosophers as being in some sense engaged in the same project, but only "in some sense", for the explanandum of "asymmetry" is not unambiguous -there are, in fact, a variety of asymmetries at stake, which call out for different explanations. The literature on self-knowledge is diverse, and the current issue is no exception.We first of all need to distinguish between the claim that we are epistemically privileged with respect to our own states and the claim that we have first-person authority over them. The distinction is subtle but important. Being epistemically privileged means that our second-order beliefs about our first-order states are more likely to result in knowledge, compared, for instance, to the way in which we gain knowledge of others' mental states or the external world (sometimes also referred to as "first-person privilege" or "privileged access"