“…If inter-individual variability among experts is sometimes addressed (Bril et al, 2010;Gandon et al, 2020), little is known about what happens in novices practising a technology and what to expect in terms of mistakes and the variability they could provide in material production. In line with previous studies which suggest criteria to identify learning stages for Palaeolithic stone-tool productions (Klaric, 2018), a quantitative approach to mistakes is proposed by Centi, Valletta and Zaidner (2023). The contribution discusses differences in knapping skill as the main agent of technological variability and lithic assemblages' formation.…”