The aim of this article is to assess the impact of Lean Manufacturing tools on the work organization of two selected manufacturing company’s departments. In order to determine the effectiveness of lean concept, organizational measures were presented. They were to improve production process efficiency of the analyzed departments. The following were analyzed: standardization of the selected worksites and time reduction of tasks performance in a production process during a changeover. The study confirmed a research hypothesis that implementation of Lean Manufacturing tools guarantees time and resources savings, improves company’s operation, eliminates waste.