the outgoing lepton which assumes CCQE kinematics [@coloma_erec; @ankowski_erec]. Additionally, the Random Phase Approximation (RPA) is a nuclear screening effect that modifies the propagator for interactions in nuclear matter [@Jachowicz:1998fn; @Jachowicz:2002rr; @nieves; @martini] and has a significant effect on the differential cross section as a function of [$Q^{2}$]{}, suppressing the cross section in the low-[$Q^{2}$]{}region and enhancing the cross section for ${\ensuremath{Q^{2}}\xspace}\gtrsim 0.5$GeV$^{2}$. RPA needs to be included, both in interactions with a single nucleon (1p1h) and those from 2p2h calculations, to find good agreement with data. Note that both Nieves and Martini calculations are performed in the context of a local Fermi gas (LFG) model, where the Fermi momentum depends on the local nuclear density, so improvements to the initial state models of the nucleus and improvements to the CCQE interaction models cannot necessarily be combined easily.\
Whilst there have been rapid experimental and theoretical developments relating to CCQE cross sections, new nuclear models and nuclear effects have only recently been implemented into neutrino interaction generators or confronted with neutrino-nucleus scattering data, and no consistent picture has yet emerged. It is not clear which models fit the global data best, and where the deficiencies now lie, which should be 