The final step in multicriteria decision making is to develop a decision matrix displaying the products of the importance weights (or ranks) and the alternative scales (or ranks). Table 2.5.4 shows a simple weighting-rating checklist used in an environmental impact study of sites for a wastewater treatment plant (Wilson 1980). Two groups of importance weights are used, with factors assigned an importance weight of 2 being more important than factors assigned an importance weight of 1. Each of the three sites in the study is rated on a scale from 1 to 3, with 1 denoting an undesirable site and 3 a desirable site relative to thirteen decision factors. The best overall site based on a composite evaluation is Site C.
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