 Hempelian and HD confirmation, as discussed above, are qualitative theories of confirmation. They only tell us whether evidence \(e\) confirms (disconfirms) hypothesis \(h\) given \(k\). However, assessments of the amount of support that some evidence brings to a hypothesis are commonly involved in scientific reasoning, as well as in other domains, if only in the form of comparative judgments such as “hypothesis \(h\) is more strongly confirmed by \(e_{1}\) than by \(e_{2}\)” or “\(e\) confirms \(h_{1}\) to a greater extent than \(h_{2}\)”. Consider, for instance, the following principle, a veritable cornerstone of probabilistic confirmation in all of its variations (see Crupi, Chater, and Tentori 2013 for a list of references):