Creating value for stakeholders with maximum productivity is a goal obtained by lean enterprise. In this paper designing comprehensive and valid assessment model is observed for lean enterprise, after reviewing literature and comparing assessment models of lean enterprise to each other, the conceptual research models was designed by considering assessment models of lean enterprise and also APQC framework for classifying the processes in three dimensions: Enablers, Business Processes and Business Results. For this, the three main Iranian automakers Iran khodro, SAIPA and Pars khodro have been assessed by performing a field research through their managers’ viewpoints. Next, the research model and impressing the model dimension on each other have been considered and validated by structural equation modeling. Therefore, it has been used from conformity factor analysis, path analysis and t-value. Shanon Entropy has been used in order to weight the components and variables of the model. The results obtained shows that enablers impress on business results through business processes and there are meaningful relations among them. In addition to impress triple model dimension on each other, their factors have a meaningful relationship with each other. In other words, we cannot achieve the lean enterprise model without making strong links between its factors and components, and it is necessary to create integration within its components and factors.