Kano et al. (1984) developed a two-dimensional (linear and
non-linear) quality model to address linear quality model shortcomings.
This two-dimensional model divides quality criteria into
must-be quality, one-dimensional quality and attractive quality.
These terms describe the effect of a product’s attributes on customer satisfaction. The traditional Kano model depends upon
questionnaire and interview. It is found that data collected through
questionnaires are sometimes very much ambiguous or vague and
insufficient to interpret the significant results. Therefore, fuzzy
Kano approach can be used to overcome this kind of deficiency for
calculation of importance of different attributes.