It depends severely on judgments of designers for the ranking order of criteria and it might occasionally be
resulted in inconsistent and contradictive knowledge. For example, although in this research, the ranking order of criteria is based on additive alliances as discussed in Section 4, it may be possible to propose different order by designers. Also, in this paper the traditional AHP was applied for comparing the FLPs with respect to each qualitative criterion in the PCM using crisp ratios