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hre bifa ona s ca ime derp pretative breadth of current models explaining morphological variation in bifacial tools is then tested the fo l fram ral pa ks bet sment However, the majority of research on the form of large cutting tools relies on traditional measurements (e.g. Bordes, 1961; Roe, 1964; Isaac, 1977). Subsequently, the vast majority of variables that have been used to study variation in large bifacially flaked cutting tool assemblages are those that focus on aspects of two-dimensional collection from the Middle Pleistocene site of Elandsfontein (Singer and Wymer, 1968; Klein, 1978, 1982; Klein and Cruz-Uribe, 1991; Klein et al., 2007), on the west coast of South Africa to answer two related questions. First, can the major source of variation in LCT form be found in the classic two-dimensional measures of shape, or do three-dimensional measures isolate aspects of form variation that have previously been unaccounted for in behavioral models? Second, can either raw material characteristics or reduction intensity be identified as factors that directly explain LCT shap