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3.2.1 Network design decisions

Ballou (1993) considers that the design of a logistics system should be based on four business areas. The first deals with customer service levels. Logistics customer service includes the availability of the product, the time required by a customer to receive the product, the condition the product is in when it is received, and the accuracy of filling the customer's order. The second area deals with the location of facilities and the demand allocated to them. The third deals with inventory policy and the fourth with transport decisions. It is apparent that all four of these critical areas are economically interrelated and should be planned collectively.

The network design does not only concern the spatial layout of the facilities (location), but also the flow of materials through the various facilities within the supply chain (allocation). Location and allocation determine the way inventory and transportation are managed by the firm and the costs associated with these activities.

These two dimensions of supply chain network design, location and allocation, are called spatial and temporal aspects of the network design. The spatial aspect deals with the location or geographic placement of the facilities; the temporal aspect deals with the flow of product through the network over time (Ballou 1999). The objectives of the network design are fundamentally different from a simple facility location decision based only on minimum overall transport costs. The network design decision requires an integrated approach and this considers all logistics elements of warehousing, transport and inventory as inseparable parts of a system.

The type of decisions involved in the network planning process provided below are suggested by Chopra and Meindl (2001, pp.304):

There are many examples of firms gaining considerable advantage by realigning their existing supply chain networks. The following two readings will provide you with practical examples of network design decisions taken by firms with two different objectives.


Reading 3.1

Cooke, JA (2001, March) ' Toyota tunes up its distribution network', Logistics ,
pp.40-42.

Reading 3.2

Coia, Anthony (2001, January) 'Timberland keeps in step with a changing Europe ', Logistics Management and Distribution Report , Supplement , pp.E4-E7.

Activity 3.1

Sketch a map of Europe and place the old supply chain network of Timberland on the sketch. Take any convenient port in each of these countries where Timberland had a DC and trace the approximate market area covered by these distribution centres. You should assume that these markets cover mainly the respective countries plus adjacent countries which could be the natural hinterland of the particular DC. Locate the new EDC and trace inbound shipments through the port of Rotterdam . Draw the possible transport routes and modes required to serve the same markets from this EDC.

Compare the old distribution network to the new one and see how radically the transport patterns would change.

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