This proposal requests three days on the Polaris diffractometer to investigate the nature of local structure in the well known proton conducting perovskite system BaInxZr1-xO3-x/2 (x = 0-0.75, hydrated samples). Recent Raman spectroscopy results indicate the presence of pronounced short-range (local) structural distortions of the long-range (average) cubic structure, which are induced by the In doping and which increase in strength with increasing In concentration. The Raman data also suggests a "threshold" composition in the range x = 0.10-0.25, which correlates to a jump in proton mobility. However, the mechanistic features (such as bond angles and distances, symmetry, oxygen and/or cation ordering) of the local structure and compositional "threshold" are not yet known. To obtain this information will shall perform reverse Monte Carlo modeling of neutron total scattering data.