Service Station Evaluation Problem in Catering Service of High-Speed Railway: A Fuzzy QFD Approach Based on Evidence Theory

Table 6

An analysis on a truth-qualified proposition.

	Column 1		Column 2		Column 3
Canonical form		is		is
Example	Construction cost	is	important	is	true
Description	BOE expressing evidence about		Fuzzy sets expressing predicates		The truth of “ is ”
Math expression
Methods	By organizing questionnaires from experts		By estimation from QFD team (see Algorithm 3)		By (10) in evidence theory
Analysis step	Step  1 in Algorithm 5		Step  2 in Algorithm 5		Step  3 in Algorithm 5