**5. Conclusion**

The Ishikawa diagram is an effective tool for discovering the sources of problems in enterprises. It allows to classify and establish a hierarchy of a set of various statements, causes of faults, in a situation where this set is chaotic. However, it gives the opportunity to look at the production or activity of the company from the point of view of many areas that are often not suspected of affecting the broadly understood quality. When using the diagram, however, you may encounter difficulties:


Difficulties can also arise when determining root causes using the 5 Whys:


The examples shown illustrate different production situations. A similar approach could be taken in many areas, for example, in the area of Man, by identifying the causes of errors inherent in the human mentality and mental and physical condition. Sometimes, the Ishikawa diagram was modified to include other issues, such as those related to computer operation and data flow. You can also encounter a situation when 5 Whys leads to a surprising discovery of the negligence of the employer, or draws attention to a seemingly insignificant problem that—as it turned out in point 4.3—can affect the health of employees.

Based on the examples, it can be concluded that the knowledge of manufacturing technology always plays a key role. However, in the production process, the subject is man, and his behavior determines the course of this process. Finally, it should be emphasized that the production process and its improvement should start with the management. The lack of awareness of the management and the lack of management skills can have a negative impact and manifest in the lack of training, motivation, and incentives for professional development of employees. Thus, it is difficult to talk about quality management of products and processes.
