1. 3. Clark, K., Fujimoto, T. and Chew, W.Product Development in World Auto Industry, Brookings Papers on economic activity No. 3, 1987.
2. 4. Vantrappen, H. and Tjon, K. “Produktiviteit in Produktontwikkeling”,De Ingenieur, No. 10, 1992, pp. 46‐50.
3. 5. Takeuchi, H. and Nonaka, I.The New Product Development Game, (Study of methods at PTY, Canon, Honda and Fuji).
4. 6. Honert, A.V.D. “Marketing View of Project Start‐up”,International Journal of Project Management, Vol. 10 No. 4, November 1992.
5. 7. Böner, M. “De Versnelling”,Elan, No. 4, April 1992.