A Novel Approach Based on Kano Model, Interval 2-Tuple Linguistic Representation Model, and Prospect Theory for Apperceiving Key Customer Requirements

Table 8

The calculation formula when the attribute value is the interval number.

Attribute type	The relationship between attribute value and the reference point	Calculation of gain () and loss value ()
			(24)
			(25)
			(26)
			(27)
			(28)
			(29)