  It is shown that several ratios of neutral to charged current cross sections
are determined accurately, because the largest contribution is determined by
isospin symmetry and the smaller terms are estimated from data or theoretical
calculations. This way the theoretical uncertainty is very small. It is further
discussed that the ratios can be measured at various distances from the origin
of the neutrino beams, because an increase with distance will be indication for
neutrino oscillations and will allow a precise determination of the oscillation
parameters. Finally, coherent scattering is discussed as a useful reaction for
oscillations and as a means of searching for new light particles.
