  The extraction of neutrino properties from long-baseline experiments such as
T2K, NOvA and DUNE requires a good description of the initial neutrino-nucleon
interaction. Since the targets in all running or planned experiments are nuclei
(C12, O16, Ar40) the extraction also requires a reliable description of nuclear
structure and nuclear reactions that become essential during the final state
interactions of the neutrino-nucleus reactions. This article presents a short
introduction into these problems for a non-expert readership. It also stresses
that a generator that implements state-of-the-art methods of nuclear structure
and reactions is still needed for these state-of-the-art experiments.
