Purpose: The paper presents an example of the application of the complex quality control process and shows the advantages of such approach. Moreover it presents the analysis of a specific manufacturing process of rings of train wheels. Design/methodology/approach: In the presented works it has been presented a holistic approach to the process engineering. The investigations in the manufacturing plant and laboratory test allow showing the results of a complex quality control. Findings: Results confirm the importance of the new process engineering which links the traditional approach with the modern quality control. Also it proves that the quality control system must cooperate with the training system. Research limitations/implications: The investigation area has been limited to one industry plant. It was considered with the fact that the analyzed process is a much specified one. This situation doesn’t make possible to compare results with the other data. The second limitation is considered with the commercial secret (some data is omitted). Practical implications: First main practical results could be described as elaborating the methodology of quality assurance of the specific and rare manufacturing processes. Secondly the paper shows how to link the technical and human factors in one integrated process. Originality/value: Firstly this paper presents the analysis of a very rare manufacturing process what is valuable of both scientific and educational points of view. Secondly it shows how to organize the rare production process with a complex quality control.