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.
"Matheson has provided us with an excellent overview of some of the most prominent positions and arguments in the literature so far. Matheson's discussion is clear and organized thematically in a way that makes it well suited as an introductory text on the epistemology of disagreement. Matheson's book is not only intended to provide an overview of the existing debate about disagreement, it is also meant to contribute to that debate by mounting a systematic defence of a conciliatory view ... ." (Finnur Dellsén, Philosophical Quarterly, Vol. 67 (269), October, 2017)