The aim of the research is to analyze the performance and efficiency of the production processes of dish-washing machines in order to increase the production capacity. Initially, the production processes of a selected dish-washer model in the production line are observed, and the duration of all process steps are measured via time study. Then the process parameters, i.e. cycle time, changeover, inventories as well as the information flows are analyzed with the Current State Value Stream Map. Improvement opportunities based on findings are discussed with the company managers. Afterwards, a simulation model of the system is developed via Arena Simulation Software. Various improvement scenarios are simulated, before-after situations are compared with the simulation model, and the one giving the best output is displayed in the Future State VSM.