This research was created in partnership with Södra an organization in the forest industry that owns 8 sawmills in Sweden. The aim of the research comes from the idea that many sawmill industries are traditional companies with modernizing aspirations. The development of more efficient, demand-driven, industrialized, computerized, and automated production is a challenge for the wood industry sector. Simulation has long been used as a basis and support in many businesses when critical decisions and adjustments must be made.  

Discrete Event Simulation (DES) is one of the technologies that have not been implemented at the same level in other industries. This research aims to improve the efficiency of production at the sawmill. To achieve this purpose, a plant simulation program has been constructed a Discrete Event Simulation (DES) model that can mimic the Södra sawmill. To improve production efficiency, different scenarios have been applied to the model.  

One of the most significant parts of using simulations is that the model developed duplicates the real system, which has been accomplished since the model matches the reality with an error percentage of 1.59 %. Proposed scenarios to increase the production at the sawmill had been simulated.  

A checklist that provides a step-by-step explanation of how the study fulfils the purpose and answers the research question has been presented in Chapter 4. Using accurate input data in plant simulation assisted in obtaining an accurate output, which means that if the data obtained is sufficient for use in a plant simulation, the model can be used to analyse any industry and improve production or, for example, cut working hours, and so on. The research question for this study is, "How can the efficiency of the sawmill's production line be increased?" The first scenario involves adding one more shift to all sawmill stations except the saw station and the dryers, which increases production output by 23.6%. The second scenario involves adding one more shift to all stations, including the saw station, which results in a 28.5% increase in output efficiency. Using those two situations, the subject of this study's investigation was satisfactorily answered, and the efficiency of the production flow was increased.