Koust is a software for managing the raw materials of a restaurant. It responds to the difficulty of managing the suppliers' goods. The problem is to manage perishable goods that are used to produce finished products. Koust therefore makes it possible to negotiate and order foodstuffs from suppliers. Then the software helps professionals to establish their data sheets quickly and easily. The next step is management control to track gaps: losses, waste. The last step is the analysis of sales by the method "menu engineering".