Some companies have already reached thelimits of the traditional manufacturing model, in other words the Manufacturing ResourcePlanning (MRP II) model. This means that, if a company and its competitors have achievedthe same goals - in terms of customer service level or on-time deliveries - the companyneeds to find other methods of improvement in order to be more competitive from amanufacturing point of view. Also, because the continuous improvement philosophy is now acommon rule in the manufacturing environment, when a company has reached a limit it needsto find a solution to progress further.