The paper presents the use of audit as a tool to improve the operation of a metal sector company. The issue of significance of performed audits and their impact on the operations has also been raised. Investigations were carried out based on documentation collected during internal audits. The article presents a number of internal audits carried out in 2011-2015. It presents the implementation of the audits conducted in different units of the company. Also discloses the structure and type of discrepancies in individual systems. The share of these incompatibilities is presented in Pareto-Lorenza’s charts. It also presents the number of the incompatibilities with the division into centers of occurrence. The article presents the number and types of improvement activities (corrective, preventive and other improvement) in the different units of the company. The adopted method of improvement through audit enabled not only to distinguish areas, which should be improved, but also revealed to what extent such changes should be made.Keywords: Audit, Improvement, ISO Management Systems
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