Abstract
The present paper intends to contribute to systematize long-lasting product development processes, for which customer information obtained at the beginning of the design task could result invalid at the time of market launch. In particular, the paper explores the reliability of dynamic Kano-oriented methods, by extrapolating and elaborating literature data of customer surveys about akin technical systems taken at different times. The statistical model that has been built elucidates to which extent forecasts of Kano quality attributes are trustworthy for designing future products and services.