 In van Fraassen (2010), Bas van Fraassen explores “the world of quantum mechanics as RQM depicts it” (2010: 390), clarifying what is and what is not relative to observers. He concentrates on the apparently paradoxical aspects of RQM. The limits on information that observers can have, which can only be acquired through physical interaction, have surprising consequences for complex situations in which an observer makes a measurement, a second observer makes measurements on the first and its target, and even a third observer comes in and observes a process involving the first two observers. Van Fraassen concludes that all the consistency questions can be laid to rest, when the situation’s representation in RQM is properly understood. On the other hand, he also observes that if in RQM what the state of a system relative to an observer is, is not itself relative to anything, then the question can be raised what relationships there are between the state of a specific entangled system or its components relative to different observers. He proposes and additional postulate, weakly relating the description of the same system as given by different observers, which forbids the possibility of disturbing inconsistencies allowed by the multiplication of perspectives.