  The Deep Underground Neutrino Experiment (DUNE) is a proposed next generation
superbeam experiment at Fermilab. Its aims include measuring the unknown
neutrino oscillation parameters -- the neutrino mass hierarchy, the octant of
the mixing angle $\theta_{23}$ and the CP violating phase $\delta_{CP}$. The
current and upcoming experiments T2K, NOvA and ICAL@INO will also be collecting
data for the same measurements. In this paper, we explore the sensitivity reach
of DUNE in combination with these other experiments. We evaluate the least
exposure required by DUNE to determine the above three unknown parameters with
reasonable confidence. We find that for each case, the inclusion of data from
T2K, NOvA and ICAL@INO help to achieve the same sensitivity with a reduced
exposure from DUNE thereby helping to economize the configuration. Further, we
quantify the effect of the proposed near detector on systematic errors and
study the consequent improvement in sensitivity. We also examine the role
played by the second oscillation cycle in furthering the physics reach of DUNE.
Finally, we present an optimization study of the neutrino-antineutrino running
of DUNE.
