Biface technologies are common, widespread, and highly varied. Each biface technology represents a culturally-determined set of methods for the manufacture and maintenance of stone tools. Workshop participants will develop skills in producing and recognizing percussion and pressure biface reduction technologies. In addition, stages of reduction, as well as the tools used in the production of bifaces will be studied. The workshop will also teach identification of characteristic manufacture and use break types, archaeological applications of technological analysis, including how to select items for obsidian hydration analysis and protein residue analysis.