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Business processes are applied in business organizations, with interconnected and interactively working activities, which convert input into output elements. These are sets of linked and structured activities or tasks that create a specific process outcome. Characteristics of business processes are: definition, orderliness, user knowledge, identification of additional values for users, connection in the organizational structure and functionality of the activity. In a business activity, it is usual to differentiate business processes, production and service processes. Business Process Management focuses on workflow optimization and business process optimization, which usually includes any combination: modeling, simulation, automation, execution, verification and optimization of business activity flows to achieve the goals. Business processes in the new Six Sigma System apply process simulations, which enable rapid checking of the effectiveness and efficiency of the process, with certain levels of trust and risk. Simulation is the imitation of physical and abstract processes or systems, in the real world over time, with a developed model that represents the system itself, with the application of certain analytical and computer techniques. The best known is the computer simulation technique of linear business processes, which is quite detailed here so it can be routinely applied in practice of compressed air flow.

Quality is the degree to which a set of permanent characteristics fulfills default, set, contracted or planned requirements for the result of the process (semi-finished product, product, documentation, services). There is a widespread belief in America that the quality is always determined by the user, not the supplier, because the quality is important not only because of the cost but because there is a completely different approach to maintaining the quality of the process. In Serbia, the applicable ISO 9000 family of standards which demonstrates the ability of suppliers, allows only stabilization of the current level of quality but not its increase that can be achieved only through better design and application of new materials and technologies. Application of Six Sigma is a different approach, which actually increases the level of quality and organization's profit; using modern computer technology it also allows the reduction of defects in the process, until the defects of 3.4 per million are realized as the results of the process. Since in Serbia, it is difficult to achieve, the authors have developed a special system of Six Sigma System, which allows realisation of a number of projects for reduction of possible costs, shortening time rational, radical elimination of losses, significante increase of the quality of the process and increase of organizations' profit.