Attributer contextualists maintain that the verb 'knows' is context-sensitive in the sense that the truth conditions of a sentence of the form "S knows that p" can be dependent upon the ascriber's context. One natural objection against attributer contextualism is that it confuses the impropriety of certain assertions which ascribe knowledge to agents with the falsity of those assertions. In an influential article, Keith DeRose has defended attributer contextualism against this charge by proposing constraints on what he calls "warranted assertibility (...) manoeuvres" of this sort. This paper argues that, contra DeRose, the warranted assertibility manoeuvre directed at attributer contextualism is able to meet the constraints that DeRose lays down. (shrink)

David Lewis (1941-2001) was Class of 1943 University Professor of Philosophy at Princeton University. His contributions spanned philosophical logic, philosophy of language, philosophy of mind, philosophy of science, metaphysics, and epistemology. In On the Plurality of Worlds, he defended his challenging metaphysical position, "modal realism." He was also the author of the books Convention, Counterfactuals, Parts of Classes, and several volumes of collected papers.

Thomas Blackson does not question that my argument in section 2 of “Assertion, Knowledge and Context” establishes the conclusion that the standards that comprise a truth-condition for “I know that P” vary with context, but does claim that this does not suffice to validly demonstrate the truth of contextualism, because this variance in standards can be handled by what we will here call Subject-Sensitive Invariantism (SSI), and so does not demand a contextualist treatment. According to SSI, the varying standards that (...) comprise a truth-condition of “I know that P” are sensitive to factors that attach to the speaker as the putative subject of knowledge, rather than as the speaker of the knowledge attribution. That is, according to SSI, these factors of the subject’s context determine a single set of standards that govern when the subject himself, or any other speaker, including those not engaged in conversation with the subject, can truthfully say that the subject “knows.” Thus, we do not get the result that contextualists insist on: that one speaker can truthfully say the subject “knows,” while another speaker, in a different and more demanding context, can say that the subject does “not know”, even though the two speakers are speaking of the same subject knowing (or not knowing) the same proposition at the same time. Given the possibility of SSI, Blackson concludes that I “either assumed without argument that [SSI] is false or failed to distinguish the different ways the standard for knowledge might be determined.” I indeed have long assumed that SSI can’t be right, and so have taken a different form of invariantism to be the real threat to contextualism. But since SSI, and views like it, now seem to be getting considerable attention, it is worth articulating why I find it unpromising. (shrink)

I present the features of the ordinary use of 'knows' that make a compelling case for the contextualist account of that verb, and I outline and defend the methodology that takes us from the data to a contextualist conclusion. Along the way, the superiority of contextualism over subject-sensitive invariantism is defended, and, in the final section, I answer some objections to contextualism.

In epistemology, “contextualism” denotes a wide variety of more-or-less closely related positions according to which the issues of knowledge or justification are somehow relative to context. I will proceed by first explicating the position I call contextualism, and distinguishing that position from some closely related positions in epistemology, some of which sometimes also go by the name of “contextualism”. I’ll then present and answer what seems to many the most pressing of the objections to contextualism as I construe it, and (...) also indicate some of the main positive motivations for accepting the view. Among the epistemologists I’ve spoken with who have an opinion on the matter, I think it’s fair to say a majority reject contextualism. However, the resistance has to this point been largely underground, with little by way of sustained arguments against contextualism appearing in the journals,[i] though I have begun to see various papers in manuscript form which are critical of contextualism. Here, I’ll respond the criticism of contextualism that, in my travels, I have found to be the most pervasive in producing suspicion about the view. (shrink)