# Analysis of Production Process Parameters Using Computer Simulation at the Planning Stage
## 2 Literature Review  
In the literature devoted to the possibilities of computer simulation applications, there are many tools that enable the carrying out experiments in various areas of enterprise operation. These tools are based on discrete-event simulation DES [1]; these tools includes software such as FlexSim, Plant Simulation, Enterprise Dynamics, ARENA, and SIMO, which are used in solving production problems (Table 1). FlexSim makes it possible to conduct many experiments involving problems related to the flow process [1], the assembly system and logistics in workshops [7], and the identification of bottlenecks in production processes [8] and warehouses [9], specifically in regards to proposals for actions enabling the implementation of solutions to improve production and warehouse processes, taking into account various alternatives for identified bottlenecks. It is also used in the field of educational and training activities, allowing for the creation of a virtual post-production plant, allowing users to gain insight into the functioning of the workplace [10]. The use of the software also allows for conducting analyses in the field of emergency evacuation and obtaining answers to questions regarding time spent on evacuation, as well as the possibility of shortening the evacuation time [11], which may play an important role in protecting the life and health of not only public utility unit users, but also of medical facility occupants. FlexSim also allows for finding solutions and alternatives in the regards to shortening queues (queuing systems) in health care facilities [12], as well as determining the total length of a patient's stay and identifying the need for personnel in order to avoid delays in treatment [13]. The studies also present the application possibilities of the Tecnomatix Plant Simulation software, which allows for simulation and analysis of the product throughout the production process [14]. Using the above-mentioned software, it is possible to identify bottlenecks occurring in the production process and implement solutions that allow for their effective reduction by introducing shift production, intensifying quality control before the bottleneck, expanding the machine system, or, as a last resort, purchasing semi-finished products manufactured as a result of the bottlenecks [14]. The Plant Simulation software is also used to detect bottlenecks and shortcomings in the logistics and transport systems of the company in terms of improving the throughput of the entire logistics flow and reducing inter-operational stocks [15]. Within one simulation model, application possibilities are also noted in the field of simulation of the production logistics area and city logistics [16], as well as in the field of scheduling [17]. Enterprise Dynamics (ED) is a software that provides an object-oriented programming environment for simulation, which is easy to use and comprehensive in terms of functionality [18]. This software has been used in the simulation of the production process using CNC machines [18], production, and logistics in the construction industry [19], taking into account different scenarios. This allows for the identification of bottlenecks, logistics, and spatial conflicts in logistics processes. Analyses of the occurrence of bottlenecks allow for remedial actions to be taken by the management staff in construction. The possibility of introducing changes in the designed logistics system without incurring costs is also recorded [20]. ARENA is a software that allows for creating simulation models that reflect virtually any system [21]. This software is widely used in the field of traffic simulation, among others, in terms of determining bottlenecks and defining proposals for improvements that allow for solving problems related to road traffic, taking into account various scenarios, as well as the consequences before and after their implementation [22].