The procedure used in this paper considers the QFD planning, which incorporates two interrelated HOQ matrices, as a
fuzzy multi-criteria group decision tool and employs FWA method to calculate the upper and lower bounds of the weights
of supplier selection criteria and the ratings of the suppliers. The upper and lower bounds of the weights of supplier selection
criteria are computed by applying FWA to the data given in the first HOQ, whereas the upper and lower bounds of the ratings
of suppliers are subsequently determined by employing FWA considering the weights of supplier selection criteria as inputs
in the second HOQ. As most fuzzy number ranking methods can hardly be applied in this case, a ranking method that is reported
to be more efficient and accurate than its predecessors is employed to rank the suppliers [11].