Integrating Kano Model, AHP, and QFD Methods for New Product Development Based on Text Mining, Intuitionistic Fuzzy Sets, and Customers Satisfaction

Table 3

Symbols and IFVs in QFD.

Symbols	Definition	IFVs
Blank	No relationship	(0.1, 0.9)
△	Weak relationship	(0.3, 0.6)
○	Medium relationship	(0.6, 0.3)
◎	Strong relationship	(0.9, 0.1)