This Masters Thesis deals with the concept of lean manufacturing and its implementing specifications in Czech companies. The theoretical part describes the concept of lean in detail, its history, principles and other characteristics. Furthermore this part presents the analysis related to the implementation of lean principles in small and medium sized companies in the Czech Republic. Based on this analysis, the hypothesis about the success or failure of implementation is formulated. The practical part describes the implementation of the chosen lean tool in the international operating company. On the basis of this project, the hypothesis is affirmed or denied.