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The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuseson a problem that is of crucial importance for future observations incosmology. The shapes of distant galaxies can be used to determine theproperties of dark energy and the nature of gravity, because light from thosegalaxies is bent by gravity from the intervening dark matter. The observedgalaxy images appear distorted, although only slightly, and their shapes mustbe precisely disentangled from the effects of pixelisation, convolution andnoise. The worldwide gravitational lensing community has made significantprogress in techniques to measure these distortions via the Shear TEstingProgram (STEP). Via STEP, we have run challenges within our own community, andcome to recognise that this particular image analysis problem is ideallymatched to experts in statistical inference, inverse problems and computationallearning. Thus, in order to continue the progress seen in recent years, we areseeking an infusion of new ideas from these communities. This document detailsthe GREAT08 Challenge for potential participants. Please visithttp://www.great08challenge.info for the latest information.

Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing