This paper describes the CRC (class, responsibility, collaboration) modelling process for building product models. The proposed CRC modelling process includes: organising the CRC modelling team, educating relevant personnel, and iteratively performing the steps of CRC modelling (find classes, find responsibilities, define collaborators, etc.). CRC modelling covers some of the basic work before ... [Show full abstract] the actual implementation of the product model in a standard configuration software. This article focuses on the application of CRC-cards in the analysis phase.The concepts and methods for modelling product knowledge have been tested in Danish industrial companies. The article presents a case study from Alfa Laval Separation.