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One of the Survey Science Projects that the Australian Square Kilometre ArrayPathfinder (ASKAP) telescope will do in its first few years of operation is astudy of the 21-cm line of HI and the 18-cm lines of OH in the Galactic Planeand the Magellanic Clouds and Stream. The wide-field ASKAP can survey a largearea with very high sensitivity much faster than a conventional telescopebecause of its focal plane array of receiver elements. The brightnesssensitivity for the widespread spectral line emission of the interstellarmedium depends on the beam size and the survey speed. In the GASKAP survey,maps with different resolutions will be synthesized simultaneously; these willbe matched to different scientific applications such as diffuse HI and OHemission, OH masers, and HI absorption toward background continuum sources. Agreat many scientific questions will be answered by the GASKAP survey results;a central topic is the exchange of matter and energy between the Milky Way diskand halo. The survey will show how neutral gas at high altitude (z) above thedisk, like the Magellanic Stream, makes its way down through the halo, whatchanges it experiences along the way, and how much is left behind.

GASKAP -- A Galactic Spectral Line Survey with the Australian Square Kilometre Array Pathfinder