Abstract

Shifty epistemologists allow that the truth value of “knowledge”-ascriptions can vary not merely because of such differences, but because of factors not traditionally deemed to matter to whether someone knows, like salience of error possibilities and practical stakes. Thus, contextualists and subject-sensitive invariantists are both examples. This paper examines two strategies for arguing for shifty epistemology: the argument-from-instances strategy, which attempts to show that the truth-value of knowledge-ascriptions can vary by proposing cases in which they vary (e.g., the bank cases, the airport case), and the argument-from-principles strategy, which attempts to specify general features of knowledge or ‘knowledge’ which guarantee the existence of cases of truth-value variation. This paper urges shifty epistemologists to consider the merits of emphasizing the latter strategy over the former.