có thể để phối hợp thay đổi với việc tiêu thụ các bộ phận ngày. Phối hợp như vậy giảm chi phí phế liệu đáng kể. * Cải thiện quan hệ khách hàng. MRP có thể được sử dụng để xác định khả năng của cuộc họp ngày giao hàng được đề xuất trước khi làm cho tiếp thị trích dẫn giao. | 9 7 2006 9 46 AM Page 84 are able to coordinate changes with the consumption of dated parts. Such coordination decreases scrap costs substantially. Improved customer relations. MRP can be used to determine the likelihood of meeting proposed delivery dates before marketing makes delivery quotations. In addition if an item with a promised delivery goes off schedule and cannot be brought back on schedule customers can be notified in a timely manner so that they can revise their plans with minimum inconvenience. Although MRP appears to be highly desirable there have been many unsuccessful applications. To be implemented successfully six prerequisites are essential 1. A commitment by all levels of management 2. Stable employment for those who implement and use the system during its initial stages of operation 3. The availability of timely and accurate data including scheduling accurate bill of materials precise inventory records and stores counts 4. The active involvement of those who will use the system in its design and implementation 5. Schedule stabilization for designated production periods perhaps one month a minimum of one week 6. Computer data input discipline If you use it report it. Just-in-Time Systems MRP systems are push production-inventory control systems since they are internally generated from a master schedule that is the forecast at the front end drives all the shop floor scheduling ordering from suppliers and operations. JIT systems copied from the Japanese concept of kanban are pull systems and work in reverse of MRP by literally waiting for an actual order for delivery to a customer or inventory . At a certain reorder point at each workstation a production release device card light signal directs the products of for example workstation one to move to workstation two in a continuous flow. This system includes materials requisition devices for suppliers. In theory we have just enough at just the right time at any particular workstation. Multiple .
