Abstract
Disagreements about scientific ontology have frequently been reconstructed as the result of a dispute between rival epistemic stances. In this paper, (i) we characterize some of these disagreements as deep disagreements. In addition, we show that deep disagreements about scientific ontology can arise not only from the adoption of different epistemic stances, but also between positions that fall within the same stance. The development of this point allows us, in turn, to establish a distinction between types of deep disagreement and to explore the possibility that there are differences of degree between them.