The manufacture of flint tools is a reductive process that can be summarized in a flow model as follows (Fig. 1): In all, seven activity sets can be distinguished: 1. The acquisition of raw material 2. The first selection of blocks suitable for further reduction 3. Preparation of the core 4. Flake/blade production 5. Retouching 6. Use 7. Discard/loss Two main feedback loops exist. First, the correction/rejuvenation of reduced cores; second, the 'recycling' of worn implements, either maintaining them in their original function or modifying them into other tools.