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2.5 MRP 1 and 2

There are two kinds of MRP and the difference between them is important to understand. MRP1 is materials requirements planning and MRP2 is manufacturing resource planning. MRP1 is a production and inventory control system that seeks to minimise inventories but retain sufficient material for the production process. In addition, it helps in the planning of manufacturing activities, delivery schedules and purchasing. When production does not follow a constant pattern, e.g., when production is to order, and demand for material is highly variable, MRP1 can improve business results. The elements of MRP1 are shown in Figure 3.3.

Figure 3 The MRP1 system

Figure 3 The MRP1 system
Adapted from: (Sohal A. & Howard K 1987)

The disadvantages of the MRP1 system are obvious: It focuses on reducing inventory, which can, in turn, raise total costs through increased transport needs and unavailability of bulk discounts; and it does not cater for supply interruptions.

MRP2 encompasses the whole range of activities involved in the production process. In addition to the elements of MRP1, it has production planning, resource planning, MRP1, shop floor control and purchasing. The system was developed first by Oliver Wight and he classified it into four groups:

The benefits of the MRP2 system are again along the lines of those for MRP1. They include inventory reduction, higher inventory turnover, improved customer service, and reduction of costs. The following reading discusses these systems and links them back to TQM.

Reading 2.6

Ip, W, Chau, K and Yam, R (1999), 'Enhancing manufacturing information management through TQM' , Logistics Information Management , vol 12, no 4, pp. 315-324.

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