  In this paper, we investigate similarities and differences between the main
neo-Copenhagen (or "epistemic-pragmatist") interpretations of quantum
mechanics, here identified as those defined by the rejection of an ontological
nature of the quantum states and the simultaneous avoidance of hidden
variables, while maintaining the quantum formalism unchanged. We argue that
there is a single general interpretive framework with a common core to which
all these interpretations are committed, so that they can be regarded as
different instances of it, with some of their differences being mostly a matter
of emphasis and degree. We also identify, however, remaining differences of a
more substantial nature, and we offer a first analysis of them. We also argue
that these remaining differences cannot be resolved within the formalism of
quantum mechanics itself and identify the more general philosophical
considerations that can be used in order to break this interpretation
underdetermination.
