The Kano model of customer satisfaction is a useful tool to classify and prioritize
customer needs based on how they affect customer’s satisfaction (Kano
et al., 1984). It captures the nonlinear relationship between product performance
and customer satisfaction. In practice, four types of product attributes
are identified: (1) must-be attributes are expected by the customers and they
lead to extreme customer dissatisfaction if they are absent or poorly satisfied,
(2) one-dimensional attributes are those for which better fulfillment leads to
linear increment of customer satisfaction, (3) attractive attributes are usually
unexpected by the customers and can result in great satisfaction if they are
available, and (4) indifferent attributes are those that the customer is not interested
in the level of their performance.