  I discuss the near-degeneracy between models of neutrino-nucleus interactions
based on diverse assumptions, and analyze a specific example illustrating how
the different reaction mechanisms taken into account, as well as the
approximations associated with their implementation, may conspire to make the
prediction of two models look similar. I argue that the relevant reaction
mechanisms may be unambiguously identified exploiting the availability of
electron-nucleus scattering data other than inclusive cross sections, providing
detailed information on the nuclear spectral function.
