“…Its use in optimizing the design of IS schemes has the advantage of representing and integrating the multiple objectives arising from the presence of multiple decision-makers into a single parameter within the model. Fuzzy sets have also been used for other environmental applications, such as the evaluation of the sustainability of production processes (Tseng et al, 2008(Tseng et al, , 2009a, the development of a municipal solid waste management model (Tseng and Lin, 2009) and the selection of sustainable industrial areas (Fernández and Ruiz, 2009) where evaluation criteria were characterized with uncertainty. Recent applications of fuzzy concepts in life cycle based optimization models have also been reported (Tan, 2008;Tan et al, 2008Tan et al, , 2009c.…”