 Lewis’s second worry is that Healey’s position fails to adequately take into account the role of conditional or counterfactual inferences in conferring content both on quantum, and on non-quantum magnitude, claims. Through its prescriptive role in applications of the Born rule, Lewis maintains, a claim about a quantum state or a magnitude implies many counterfactual probabilistic claims about magnitudes. For an inferentialist then, quantum claims and magnitude claims derive content from the corresponding inferences.