The purpose of this paper is to outline how the performance measurement system of a large manufacturing unit has evolved since the implementation of a lean-based production system. In order to fulfill the purpose, this paper has been divided into four sections. The first section outlines the theoretical background and underlines the developments made in the fields of PMM and operations management over the last decades. The second part presents the case study and outlines the data collection components and the data analysis strategies. The third part presents the findings from the case study. The fourth and concluding part highlights the expansion of non-financial PM as a result of the production system transformation, underlines the expansion of the safety performance measures and reasons around the measurement scope of the company. The paper concludes that the performance measurement system of the case company has expanded its non-financial measures considerably in relation to their financial dittos since the implementation of the production system while expanding the overall scope of measurement. More research is needed for understanding the effects on the PMS once a lean production system is implemented