European truck users prefer vehicles for which all main components are made by one producer. Thus, manufacturers must design and produce these components for their entire line. Moreover, a high percentage of export models consists of variations required by government regulations and customer demands Obviously satisfying domestic and foreign trade would not be economically feasible unless many components were interchangeable throughout the line. Magirus-Deutz has solved this problem by adopting the modular concept for a new range of vehicles, from the 11-32 ton off- and on-highway trucks to the 130-340 hp air-cooled buses with a 15-row seating capacity with aircooled engines of 130-340 hp. This paper describes their methods for applying component modules as a means of producing a high-quality, high quantity range of different trucks and buses at least cost.