We wish to investigate quaternary chalcogenides, A2ZnBQ4 (where A = Cu, Ag; B = Ge, Sn; Q = S, Se). Calculations indicate stannite (S) or kesterite (K) superstructures of both zinc blende (ZB) and wurtzite (W) type structures may result from cation ordering. Powder X-ray diffraction data at room temperature have generally been indexed on the basis of the tetragonal S-type structure but the presence of cations with similar X-ray scattering powers prevents determination of cation ordering schemes. The similarity of diffraction patterns for S and K derivatives introduces further ambiguity; phases such as Cu2ZnSnQ4 being described in several superstructures. The structure adopted also appears to be dependent on temperature. We will exploit the contrast afforded by neutrons to establish unambiguously the cation distribution at room temperature and investigate its evolution with temperature.