  We examine the capabilities of the DUNE experiment as a probe of the neutrino
mixing paradigm. Taking the current status of neutrino oscillations and the
design specifications of DUNE, we determine the experiment's potential to probe
the structure of neutrino mixing and CP violation. We focus on the poorly
determined parameters $\theta_{23}$ and $\delta_{CP}$ and consider both two and
seven years of run. We take various benchmarks as our true values, such as the
current preferred values of $\theta_{23}$ and $\delta_{CP}$, as well as several
theory-motivated choices. We determine quantitatively DUNE's potential to
perform a precision measurement of $\theta_{23}$, as well as to test the CP
violation hypothesis in a model-independent way. We find that, after running
for seven years, DUNE will make a substantial step in the precise determination
of these parameters, bringing to quantitative test the predictions of various
theories of neutrino mixing.
