1. How do designers represent to themselves the users’ needs?
2. Göbel, M., and Friesdorf, W. 2003. Optimization strategies of ergonomic product development processes with regard to ergonomics. In Ergonomics in the Digital Age, ed. E.S. Jung. Santa Monica: IEA Press. Proceedings of the XVth Congress of the International Ergonomics Association, 24-29August 2003, Seoul, Korea.