Abstract
The aim is to present an original combination of methods allowing to precisely determine the main causes of problems. The concept of the method assumes generating as many causes of a problem as possible, grouping them, visualizing, and precisely analyzing to determine the main cause of problem. The method combines the techniques such as Brainstorm, Cause-and-Effect Diagram, Fuzzy TOPSIS method (Fuzzy Technique for Order Preference by Similarity to Ideal Solution) and Fuzzy AHP method (Fuzzy Analytic Hierarchy Process). The method was tested for incompatibilities of products used in the automotive industry. The problem was a crack of the pin connecting discs in the engine gear when grinding. After used the proposed combined method, it was concluded that the main cause of this problem was the poor seating of the grinding wheel on the product. The originality of the article lies in the combination of selected quality management instruments and two fuzzy multi-criteria decision methods within one, consistent method of precisely determining various types of problems (taking into account the problems in the automotive industry).
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