We call systematic disputes that are particularly hard to resolve deep disagreements. We can divide most theories of deep disagreements in analytic epistemology into two camps: the Wittgensteinian view and the fundamental epistemic principles view. This essay analyzes how both views deal with two of the most pressing issues a theory of deep disagreement must address: their source and their resolution. After concluding that the paradigmatic theory of each camp struggles on both fronts, the essay proceeds to show that, despite their differences, these theories share some core assumptions and think of deep disagreements similarly: as grounded in fundamental epistemic differences between the parties. This underlying conception of deep disagreements the author calls “the fundamental model.” The essay provides reasons to be wary of this conception, and hence, mainstream epistemologists’ treatment of the issue.

In his 2014 article "Motivations for Relativism as a Solution to Disagreements", Steven Hales argues that relativism is a plausible disagreement resolution strategy for epistemically irresolvable disagreements. I argue that his relativistic strategy is not adequate for disagreements of this kind, because it demands an impossible doxastic state for disputants to resolve the disagreement. Contrarily, Fogelin's (Informal Log 7(1):1-8, 1985) theory of deep disagreement does not run into the same problems. Deep disagreements, according to Fogelin, cannot be resolved through argumentation because the conditions for argumentation are lacking in such contexts. I advance the view that deep disagreements arise due to differences in disputants' mutually supporting interrelated beliefs. This view avoids the hurdles caused by the tiered structure of support found at the heart of Hales's view on disagreement: the assumption that belief and perspective can be separated, and that disagreement is located (in the latter).

In "The Logic of Deep Disagreements," Robert Fogelin claims that parties to a deep disagreement lack the common ground needed for arguments to work, making the disagreement impervious to rational resolution. Although Fogelin's article received numerous responses, there has been no attempt to elucidate the epistemological theory behind Fogelin's theses. In this article, I examine Fogelin's theory of deep disagreements in light of his broader philosophy. The picture that emerges is that of relativism of distance, a la Bernard Williams. By interpreting Fogelin's theory as relativism of distance, it avoids some of the critiques that have been raised against it. 1. For a useful overview, see Finocchiaro (2011).