Quality Function Deployment and Taguchi Methods: A Pragmatical Approach
The goal of “Quality Engineering” is to design Quality into every product and all the processes that build them. Design is the most important phase for Quality both of products and processes. Two methodologies, originated in Japan, are claimed as very imp
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KEYWORDS: Quality Management, DOE, QFD. ABSTRACT. The goal of "Quality Engineering" is to design Quality into every product and all the processes that build them. Design is the most important phase for Quality both of products and processes. Two methodologies, originated in Japan, are claimed as very important for Quality design: Quality Function Deployment (QFD) and Taguchi Methods (TM). Often they are called upon as the best synergy a Company can use during development ofproducts and processes. 1
INTRODUCTION
In order to make Quality of products (processes, systems and services) a good knowledge of Quality ideas and a good experience about Quality tools for achieving Quality are absolutely needed. A person involved in Company management, especially Quality Managers need that. In order to find and use the Quality tools for Quality achievement, education of Managers on Quality is essential. Unfortunately too many managers know very little about Quality ideas and Methods. Design of Experiments (DOE) is a major element of the design activity and one of the most important methodo1ogies to achieve Quality through intelligent testing of factors that influence Quality, during the designstage ofproduct and processes. For processes DOE allows us to find the optimum setting of factors that provide the best Quality and economic yield, that is minimization of "disquality cost". One of the most widely used methodologies is the Taguchi Method (Robust Design). Quality Function Deployment (QFD) is considered by many people as "a tool which is able to ensure that the voice ofthe customer is deployed throughout the product planning and design stages", via the use ofvarious "houses of quality" that allow the collection and the organization of information about quality, features, characteristics, parts, processes and goals relative to a product or a service. The Iiterature on these methods is rapidly expanding. Therefore it seems important to stand back a bit and meditate from a managerial point of view. The paper shows, using actual cases that the Scientific Approach is able to provide the right route towards the good methods for Quality. 2
QUALITY AND PREVENTION
One can see the Ievel of "disquality" (the opposite of Quality) analyzing the new ISO documents on the Quality Systems: ISO 9001 :2000 "Quality Management Systems - Requirements" ### ISO 9004:2000 "Quality Management Systems - Guidance for Performance ### Improvement" Published in: E.Kuljanic (Ed.) Advanced Manufacturing Systemsand Technology, CISM Coursesand Lectures No. 437, Springer Wien New York, 2002.
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E. Gentili, F. Galetto
The new ISOstandards on the "Quality Management Systems" stilllack correct ideas ofQuality and of Quality Management for Prevention: they use bad1y the ideas on Improvement and Prevention. Item 8.5 of the ISO 9004:2000 is worse than before. The Members of the Tech. Committee ISO/TC 176 fall short on "Prevention", as one can see reading the "new ISO Standards" and comparing them with this paper and others in the references; in ISO 9004
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