III.1. Delivery and production times To compute the processing times, one is referred to the figure in appendix. On the information flow, a circle represents a one day processing For instance, the handling of orders (Stage b) requires 5 days. On the physical flow, a square represents simultaneously one clayI of processing and an average lot size of i 000 suitcases. For instance, at the 'Varnishing', there are 6 000 suitcases waiting or being processed *. Since the production is 1 000 suitcases per day, the overall processing time of a suitcase is 6 days