Quality Management Systems (QMS) of volume production car makers tend to be large. Complexity levels in such structures are difficult to manage. From the design release to the production stage, a manufacturer has to control roughly 9000 parts (including fixings) for a large size car. A large number of subsystems, together with their coupled interactions increase a system’s complexity. Results of the application of a model to manage complexity in some automotive companies in the West Midlands (UK) suggest that complexity reduction leads to quality improvements.