 Friederich treats quantum probabilities as rational quasi-Lewisian constraints on credence and, together with his relational account of quantum states, this enables him to refute the claim that Bell’s theorem demonstrates instantaneous action at a distance. He uses (what he calls) his epistemic conception of quantum states to dissolve the measurement problem by denying that an entangled superposition of system and apparatus quantum states is incompatible with the occurrence of a definite, unique outcome. Like Healey, he appeals to decoherence in picking out the particular observable(s) a suitable interaction may be considered to measure.