  We reconsider briefly the relation between "physical quantity" and "physical
reality in the light of recent interpretations of Quantum Mechanics. We argue,
that these interpretations are conditioned from the epistemological relation
between these two fundamental concepts. In detail, the choice as ontic level of
the concept affect, the relative interpretation. We note, for instance, that
the informational view of quantum mechanics (primacy of the subjectivity) is
due mainly to the evidence of the "random" physical quantities as ontic
element. We will analyze four positions: Einstein, Rovelli, d'Espagnat and
Zeilinger.
