Sceptical arguments in epistemology usually take a distinctive form: they raise doubt that some epistemic standing – typically, knowledge, though not always – is as prevalent as it is ordinarily taken to be. To the extent that such arguments succeed, the upshot is that we know, justiably believe (etc.), much less than we supposed, and thus our total epistemic position is worse off than anticipated. It will be useful to note three ways in which we might individuate varieties of scepticism.