This paper considers fundamental elements of multi-objective decision support (MODS) for transport proposals, with a view to "getting it right". Consideration is given to identification of objectives, measurement of outcomes and value transformations, weighting of objectives and attributes, and characterisation of uncertainty and sensitivity testing. Further, it is suggested that although relatively sophisticated MODS technologies have been developed in recent years, MODS based on additive weighting has potential to complement more traditional cost-benefit techniques in a broader assessment of transport proposals that includes not only efficiency criteria but also non-monetary and intangible impacts. Additive weighting has the advantage of transparency and has shown to be readily understood by decision-makers and stakeholders. Some recent developments and variants of additive weighting are considered (including stochastic and fuzzy versions which more adequately acknowledge the uncertainty pervasive in decision-making). It is believed that these developments have potential to enhance the effectiveness of transport decisions. It is concluded that although some limitations of MODS are apparent, MODS technology has significant potential in comprehending the diverse range of impacts associated with transport proposals and affords substantial opportunities for more rational and comprehensive assessment and more effective and accountable decision-making. (A)
Abstract