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The diploma work is dealing with solution of concrete problem from the industrial practice. The main aim is to increase the quality in trailer production. The section of state of the art includes the description of selected characteristics about the company AGADOS, analysis of production process including controlling and monitoring activities. The theoretical study introduces processes and methods of planning for continuous improving of quality. The evaluation of monitored results with the support of IS tools was proceeded by construction of recognized divergences by the help of Pareto diagram. After the implementation of corrective proceedings to improve the quality, which was estimated in terms of processing engineering, repeated evaluations have been applied. The effectiveness of proposed proceedings is illustrated by construction of Pareto diagrams, which are presenting the complex examination of changes before and after implementation of corrective proceedings.