It is important to keep in mind that analogies can only provide clues and not sound, definitive answers to research questions. For this reason, G.S. McCall calls for a comparative view for analysis in his cross-cultural study of the Gamo and Konso of southern and central Ethiopia, the Siberian Chukchi, highland New Guinea, highland Maya of Guatemala and Mexico, central, northern, and western arid regions of Australia, the Tjmba of northern Namibia, and the Xeta of Amazonia and their uses of lithics.[6]