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In this contribution I will review the analysis of theEinstein-Podolsky-Rosen argument, Bell's inequalities and of associatedexperiments for spins in terms of positive operator valued measures.Specifically, I will explore the relation between theClauser-Horne-Shimony-Holt inequality and a fundamental \emph{classicality}property of observables -- their \emph{coexistence}. A derivation of Bell'sinequalities for unsharp spins will be given which follows a reconstruction byMittelstaedt and Stachow of the original EPR argument. In this context wediscuss the need for a consistent relativistic description of localisedmeasurements, carried out in spacelike separated regions of spacetime onspatially extended, entangled systems.

EPR-Bell Tests with Unsharp Observables and Relativistic Quantum Measurement