Parts lists in motor-industries are very complex and as well very dynamic entities. They are changed up to 600 times a year. New parts are constructed in the context of an already existing parts list. Verifying and certifying the completeness of such lists is an expensive and time-intensive job which requires several experts' work. In this paper we present the results of a feasibility study performed together with the Messrs. Wilhelm KARMANN GmbH. The goal was to verify the completeness of parts lists of the tailgates of the GOLF. To fulfil this task we developed the SPOCK system on the basis of the configuration tool PLAKON [Cunis et al. 1991]. At the end all missing and surplus parts of variants parts lists were identified, even those that were missed by the experts of Karmann.