Industrial development usually combines different methodical approaches and, in more or less all cases, does employ a variety of different tools in its development process. The CESAR EU project aims at building a platform for the integration of these tools. This integration platform is a highly customizable asset that must be adapted to the organisational and technical characteristics of the partners' projects. To solve the configuration problem, the platform is considered as a product line with the integrated tool chains specifically tailored for the partners as its product line members.