  The neutrino research program in the coming decades will require improved
precision. A major source of uncertainty is the interaction of neutrinos with
nuclei that serve as targets for such experiments. Broadly speaking, this
interaction often depends, e.g., for charge-current quasi-elastic scattering,
on the combination of ``nucleon physics", expressed by form factors, and
``nuclear physics", expressed by a nuclear model. It is important to get a good
handle on both. We present a fully analytic implementation of the Correlated
Fermi Gas Model for electron-nucleus and charge-current quasi-elastic
neutrino-nucleus scattering. The implementation is used to compare separately
form factors and nuclear model effects for both electron-carbon and
neutrino-carbon scattering data.
