An estimator for bidirectional (naviform) blade productivity in the Near Eastern Pre-Pottery Neolithic B

► Bidirectional knapping technology is a hallmark of PPNB chipped stone assemblages. ► We present a means for calculating targeted blade productivity of bidirectional blade cores. ► It is based on theoretical concerns, experimental knapping and refitting studies. ► The scheme is illustrated using an archaeological assemblage from Kfar HaHoresh. ► Variable blade productivity is discussed concerning incipient craft specialization.