In addition, this stringent system assesses the documentation provided by suppliers, evaluates products and includes site visits to manufacturers.
At first, the efficiency of each supplier is evaluated using the DEA model.
In the first phase, each supplier was evaluated using IDEA model of economic, social and environmental factors, separately.
In sum, suppliers are evaluated with 10 criteria.
In the previous section, the suppliers were evaluated using a DEA model with imprecise data.
Potential suppliers were evaluated and a sensitivity analysis using expert choice was performed to examine the responses of various alternatives.
The reason is that although the suppliers are evaluated separately in terms of different dimensions of sustainability, still, if the decision maker wants to evaluate its suppliers in general, a kind of tool will be needed that can evaluate the suppliers generally, considering all dimensions.
As it was mentioned in the previous sections, to implement the model in this study, 26 suppliers are evaluated with three economic, social and environmental sets of criteria.
At the chain level, all the bids from potential suppliers are evaluated and the final configuration of the supply chain is determined.
In the present study, after selecting appropriate criteria from the previous researches and categorizing them based on sustainability, the suppliers are evaluated separately in terms of economic, social and environmental conditions using DEA model with imprecise data.
