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We analyzed the relationship between goal achievement and execution variability in craftsmen who have acquired the highest "ultimate" skills of stone knapping. The goal of a knapping movement is defined as the vector of the final velocity of a hammer, crucial for detaching a flake and, consequently, for the shape of the final product. The execution of the movement is defined by the kinematic pattern of the arm (i.e., by the coordination between the joint angles corresponding to the seven armdoi:10.1123/mcj.12.3.181 pmid:18698105 fatcat:rbmsppnm4rdy3iewrkwdgzlmha