Kano survey is carried out within specific market segments that consist of customers
with similar demographic information. Let s denote the market segment
which contains a total of J customers (respondents), i.e., shftjjj ¼ 1; 2;.; Jg.
Aset of FRs is identified as Fhffjii ¼ 1; 2;.; Ig. Surveys are carried out to collect
the respondents’ evaluation of fi ðci ¼ 1; 2;.; IÞ according to the functional
and dysfunctional forms of Kano questions (Table 1). The preliminary
category of the FR is determined using the Kano evaluation table (Table 2).
For each respondent tj˛sðcj ¼ 1; 2;.; JÞ, the evaluation of fiðci ¼ 1; 2;.; IÞ
is represented as eij¼ (xij,yij,wij), where xij is the score given to an FR for the
dysfunctional form question, yij is the score given to an FR for the functional
form question, and wij is the self-stated importance, which is the respondent’s
perception of the importance of an FR. Similar to the method proposed by
DuMouchel (Berger et al., 1993), this research adopts a scoring scheme that
defines customer’s satisfaction and dissatisfaction as shown in Table 3. The
scale is designed to be asymmetric because positive answers are considered to
be stronger responses than negative ones. Hence, the scaling has the effect of
diminishing the influence of negative evaluations (Berger et al., 1993). Furthermore,
the self-stated importance score is normalized such that it falls within
a range of 0e1, as shown in Table 4.