A Methodology for Green Supplier Selection in Food Industries - Technology Management for Sustainable Production and Logistics - page 9

This methodology has been developed in two main phases of criteria selection
and supplier selection. The two-phase multi criteria methodology is as follows:
1. Identifying the regular conventional and green criteria for supplier selection
from review papers, weighting the evaluation factors using AHP, and then
determining the most suitable criteria based on expert opinions using TOPSIS.
2. Giving weights to the determinant criteria using AHP, examining potential sup-
pliers and transforming linguistic variable (expert team opinion) to fuzzy num-
bers, evaluating and ranking the potential alternatives using GRA.
The proposed supplier selection process is shown in Fig. 2 and phases of supplier
selection process are explained below in details.
This methodology can find company preferences systematically; rank all potential
suppliers, and finally select correspondent supplier by five main steps (Fig. 3 ):
(a) Review company requirements and literature. Make a set of candidate criteria
and determine evaluation factor for ranking criteria based on company
preferences;
(b) Conduct pairwise comparisons of evaluation factors by expert team manager,
and calculate evaluation factors weights using AHP technique;
(c) Score candidate criteria based on evaluation factors, construct decision matrix
and rank candidate criteria using evaluation factors weights and TOPSIS
technique;
Fig. 2 Structural methodology for green supplier selection