The above is, in principle at least, not unique to Green's function method approaches used as high-accuracy methods for subsystem I. We will see later that the statedependence and total energy perspective can be partially circumvented making use of the dielectric screening intrinsically present in GW-BSE via the self-energy and the screened Coulomb interaction. In what follows, we will review some specific choices for embedding strategies in the context of GW-BSE both from a methodological point of view and by showcasing application examples. We will differentiate embedding with other quantum-mechanical (QM/QM) methods and embedding with classical molecular mechanics (QM/MM) methods.