Due to the large number of various defects occurring during the production process of the spreading drum of a process trailer, the primary goal of the research was to develop a method for improving its quality and attempt to implement it at a selected company. Achieving the primary goal required a detailed analysis (participant observation) of the spreading drum production technology, diagnosing the causes of the defects, and, based on this, proposing solutions that would eventually eliminate all imperfections (quality orientation). From the perspective of the method's practical application, a set of criteria was proposed for its evaluation. This assessed its suitability for the specific process of producing the spreading drum of a process trailer.