Every graduate of engineering fields in his technical practice will encounter manifestations of limit states and degradation of technical objects. The consequences of these processes must be solved so as to ensure the required quality and safety, while ensuring the economic viability of the manufactured technical object. The consequences of the degradation processes of the technical objects lead not only to undesirable changes of properties and consequent shortening of the life cycle of a technical object, but also to economic losses and endangering the safety of the user of this object. Therefore, it is necessary to apply such a system approach for the evaluation of degradation processes, which will be repeatable for different types of TO and will lead to the detection of causes of degradation of TO. The methodology of a comprehensive approach to the degradation processes of TO has these main steps: localization and description of TO degradation manifestations; theoretical analysis of internal and external TO factors; description of the actual status of the TO and the actual conditions under which it was issued; determination of the factors that may cause boundary states and degradation processes TO; assessment of TO degradation-TO analysis using microscopic, destructive and non-destructive tests; processing results, determining causes of TO degradation; concluding conclusions to avoid the development of degradation processes of TO, resp. limitation of TO degradation. This methodology will be applied when dealing with a particular case from technical manufacturing practice. It is part of Shaft Throttle, which was made of 11SMnPb30 automatic steel according to CSN EN 10027-1. On this component during the manufacturing process on the surface unwanted corrosion products appeared. The aim of this article is to demonstrate to students of technical fields the application of a complex system approach methodology to solve a particular problem.