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We present a novel interpretation of the Wigner-Araki-Yanase (WAY) theorembased on a relational view of quantum mechanics. Several models are analysed indetail, backed up by general considerations, which serve to illustrate that themoral of the WAY theorem may be that in the presence of symmetry, a measuringapparatus must fulfil the dual purpose of both reflecting the statisticalbehaviour of the system under investigation, and acting as a physical referencesystem serving to define those quantities which must be understood as relative.

A relational perspective on the Wigner-Araki-Yanase theorem