The transformation of the model mix within just a few years is accompanied by far-reaching changes in production. Innovative engineering and organisational production procedures are required to meet the high level of mechanisation of the Beetle and to the following generations of Volkswagens. To this end, the company embarks on an investment programme involving 2.5 billion DM between 1972 and 1975, with which the technical basis for the production of a new range of products is to be created. The plants in Wolfsburg and Emden are equipped with a suspension assembly system in 1973 allowing for production that is more flexible and for improvement of assembly conditions. The use of electronic data processing greatly aids rationalisation, for example in the press shop, where production is now directed and controlled centrally. The company reduces the production of air-cooled engines, while increasing capacities for water-cooled engines and includes new engines with the appropriate manual and automatic transmissions in its programme. Volkswagen gradually creates the pre-requisites for unit construction, allowing the use of the same parts for various models with essentially the same technology. The unit construction system is an essential part of the new production concept and an important step towards guaranteeing the company's long-term profitability.