In a 1971 study, Gould and his team compared working edge angle of Mousterain Quina scrapers and modern Western Desert Aboriginal scrapers and found the Mousterain angles to be steeper. Gould reasoned this was due to the Western Desert Aborigines retouching the scrapers further than the Hominids of the Mousterian. Gould et al. concluded that this method of studying ethnographic tool use for comparison could be employed to determine what tools were used for.[7]