The T2K long-baseline neutrino oscillation experiment has been running since
January 2010 and collected thousands of neutrino-interaction events at the
near detectors (ND280 and INGRID) with different targets. The data collected
allow us not only to measure the neutrino-interaction cross sections, but
also to probe different nuclear models. T2K is developing new tools for
unfolding the data in order to infer unbiased cross sections and exploring new
variables which probe ambiguities in the modeling of nuclear effects in neutrino
interactions at the energies most relevant for current and future neutrino oscillation experiments.
An overview of methods probing cross-section models which could be used in
other neutrino experiments will be presented in this talk. The impact of
nuclear effects on the oscillation analysis will be also outlined.