 The first, which she characterizes as logical, she defends by appealing to Moore’s distinction between understanding a proposition and knowing its analysis, making explicit the presupposition that if one can understand a proposition, then there must be some unambiguous formulation of it. The second, which she describes as metaphysical (though it is also epistemological), expresses the further—Moorean—assumption that any process of analysis must take it as granted that the proposition we are seeking to analyse can be known to be true. Stebbing here merely states that the assumption is plausible and that she has no reasons to reject it (1932: 92).