Discovering someone disagrees with you is a common occurrence. The question of epistemic significance of disagreement concerns how discovering that another disagrees with you affects the rationality of your beliefs on that topic. This book examines the answers that have been proposed to this question, and presents and defends its own answer.

Jonathan Matheson is an Assistant Professor of Philosophy at the University of North Florida. He works mainly in epistemology, and has published articles in Philosophical Studies, Episteme, and Social Epistemology among others, and is the co-editor (with Rico VItz) of The Ethics of Belief: Individual and Social.