The purpose of this thesis is to develop a visual, data-driven operational lean maturity model (LMM). The model intends to assess the level of lean maturity and the lean effectiveness in different axes of production cells (PCs).Lean is a transformation journey, in which, change management and organizational culture are critical elements of successful implementation. Diverse maturity and assessment models have been developed to evaluate and lead the organizational transformation toward leanness. The main goal of lean is to create more value for the customers by removing wastes. Despite the important role of PCs in creating value, the transformation principles in the operational level have not been considered as deserved. Moreover, the research on lean assessments has used either inputs (tools and processes) or outputs (performance) to evaluate leanness. However, to evaluate the effectiveness of lean practices, both groups of indicators should be measured separately but analyzed together.

In this paper, a visual, data-driven operational level lean maturity model is developed. The model can be used to assess the level of lean in seven axes of manufacturing cells. A case study is carried out for gathering data of analysis and explanatory study of results. Results of study show that the developed model can be used to measure the overall leanness through analysis of lean in each axis. The model can be applied by practitioners as a framework to design and develop a company-specific lean maturity model.