Enhancement of the selected management and planning quality control tools

Abstract

A detailed analysis of three management and planning quality control tools – affinity diagram, arrow diagram and process decision program chart – was performed. Then fuzzy logic was used for increase the yield of information of these tools. All three tools shown up to be flexible for fuzzy approach application. As the first, an application of an arrow diagram with a support of fuzzy logic to solution of mobile phone functionality problem at a service center for repair of mobile phones is presented. For the smooth course of negotiation between a client and the mobile phone reparation service there is a need to estimate the time of the problem solution as precisely as possible. Fuzzy logic as a supporter for an arrow diagram was used in order to determine the time interval of mobile reparation process more accurately in comparison with a standard approach. Better estimation of the time of a step “Diagnostics with the goal to find a cause of a problem” using the fuzzy logic is demonstrated. Then, an affinity diagram formed for a process of adhesive assembly of electronic components on the printed circuit board was constructed. Fuzzy approach showed the degree of an influence of the failures in some operations of the process to the failures in the following operations of this process. Non-obvious failures that could be met during a testing step were estimated and their significance was calculated. Process decision program chart (PDPC) created for assembly of electronic components on a printed circuit board based on wave soldering was also presented. The process decision program chart was constructed to identify risks and develop counter-measures (preventive actions). Volume of information, which should be involved into such the diagram, is very high. Fuzzy approach was used to find information of lower importance, which can occur, and thereby reduce the amount of entering information for processing of the PDPC diagram. The use of fuzzy logic is, with respect to the range of the thesis, documented on selected steps used in the processing of selected managerial quality control tools. The approach is generic and can be used for any technological or other type of an operation or a process to obtain deeper insight into the problem and better estimation of the course of an event under analysis.