  The interpretation of the nuclear cross sections measured using accelerator
neutrino beams involve severe difficulties, arising primarily from the average
over the incoming neutrino flux. The broad energy distribution of the beam
particles hampers the determination of the energy transfer to the nuclear
target, the knowledge of which is needed to pin down the dominant reaction
mechanism. Overcoming this problem requires the development of a theoretical
approach suitable to describe neutrino interactions at energies ranging from
hundreds of MeV to few GeV. In this paper, it is argued that the approach based
on the factorisation of the nuclear cross section provides a consistent
framework for the calculation of neutrino-nucleus interactions in both the
quasi elastic and inelastic channels. The near-degeneracy between theoretical
models based on different assumptions, and the use of electron scattering data
to advance the understanding of neutrino-nucleus cross sections are also
discussed.
