  Parity-violating polarized electron scattering from nucleons and nuclei
provides an excellent tool to extract valuable information on nuclear and
nucleon structure, as well as to determine Standard Model couplings and
higher-order radiative corrections. As measurements become more precise,
theoretical models should improve accordingly in order to exploit the
experimental data fully in extracting meaningful information. At the same time,
it is crucial that theoretical evaluations come with realistic estimations of
the corresponding theoretical uncertainties to establish that the precision
reached in the measurements is not compromised. Here we consider isospin mixing
and the charge distribution in nuclei, and strangeness content of the nucleon
together with its axial form factor.
