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The Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey aims tocharacterise the physical and chemical evolution of high-mass star-formingclumps. Exploiting the unique broad frequency range and on-the-fly mappingcapabilities of the Australia Telescope National Facility Mopra 22 msingle-dish telescope, MALT90 has obtained 3' x 3' maps toward ~2000 densemolecular clumps identified in the ATLASGAL 870 um Galactic plane survey. Theclumps were selected to host the early stages of high-mass star formation andto span the complete range in their evolutionary states (from prestellar, toprotostellar, and on to HII regions and photodissociation regions). BecauseMALT90 mapped 16 lines simultaneously with excellent spatial (38") and spectral(0.11 km/s) resolution, the data reveal a wealth of information about theclump's morphologies, chemistry, and kinematics. In this paper we outline thesurvey strategy, observing mode, data reduction procedure, and highlight someearly science results. All MALT90 raw and processed data products are availableto the community. With its unprecedented large sample of clumps, MALT90 is thelargest survey of its type ever conducted and an excellent resource foridentifying interesting candidates for high resolution studies with ALMA.

MALT90: The Millimetre Astronomy Legacy Team 90 GHz Survey