This basic framework of steps is also set out in Rowley(2000) and Rushton et al. (2000), where Oxley was a contributor or co-author. In the former publication, a further step is included, namely the use of computer simulation, to test the impact of different volume throughputs and to identify the consequences on the rest of the supply chain. It is stressed that although the steps are set out in sequence,
the overall design process is iterative in nature.