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February 28, 2013

People show less interest in DFSS

Although DFSS seems to be a very powerful tool but in reality not many company has consider to implement, existing company would rather improving their on-going project. DFSS is totally different to Six Sigma, a number of researcher has found if only use Six Sigma is unable to achieve 6 Sigma, but with combination of DFSS may able to reach 6 Sigma or even higher.

Six Sigma is commonly adopted in the production process in Europe, but country such as China shows minimum interest. There a limitations with Six Sigma process, which cannot be achieved in China. DFSS able to support development from the beginning and provide outcome that meet customers?? exact requirement. I think DFSS not only able to help achieving excellence outcome but also create a better management system, because it integrated a number management concept. Although we may not able to implement a Six Sigma project, learning Six Sigma and DFSS could inspire our way of doing things.

January 25, 2013


I have to say it is very hard for me to learn about QFD. All the numbers, equations and calculation, I am very bad at mathematics. Anything come with number I will be very confused. It has been a difficult module for me!!!

But I have read a few literatures and identified a number of advantages of QFD:

  • QFD seeking for customer demand, maximize the quality to encourage the value that customer would bring. Minimize negative elements such as defects, poor service, etc.
  • Different from the traditional design process focus on engineering technical performance and less attention to the needs of customers. QFD meet customer demand as a foundation, pays attention at every stage of their product development.
  • QFD able to make intangible demand more clear to understand, which help company to choose their priorities strategy decision making.
  • Reduce design time.
  • Reduce variation.
  • Reduce the cost of design and manufacture.
  • Improve the quality of products.
  • Improve customer satisfaction.

For example, Toyota Company reduced 61% of the startup cost loss and Mazda company reduce the half of the final design change.

There are also a number of limitations about QFD:

  • It is a developed by Japanese, western enterprise many not fully applicable because of the culture difference.
  • Customer information comes from market researchers, if they connected wrong information could course disaster to the company, because QFD rely on customer perceptions.
  • It can be very complicated in practice, because customer's ideas and needs are constantly changing.

January 24, 2013

Voice of Customer

VOS is an important part Six Sigma, which eliminate defects in the production process. VOC of need to be built into the Six Sigma methodology DMAIC, so it is suggested that DFSS is also rely on the voice of customer. Meet the customer requirement is the most essential elements of products and service, and is a key to make profit. I will share a picture showing the role of VOC in each step of DMAIC.


The benefit of DFSS is using the statistic method to understand customer and grasp the customer demand, address the principle of new product/service flow for robust design and achieve lowest cost and highest quality. DFSS help improve product quality and reliability at the same time, reduce cost and speed up the production cycle. I think an effective use of DFSS can achieve even better than Six Sigma level. Therefore, it can be said that the six sigma design is the 21st century quality management, process optimization, and the development trend of product improvement method.

January 23, 2013

DFSS Presentation

Starting at this presentation, I know nothing about Design for Six Sigma. Our group worked together first researched on the definition of DFSS, to get an over view of what it is. And we identified few elements which are shared in both DFSS and business excellence concept.

  • Customer focus
  • Stakeholder value
  • Process management

Through the presentation we have explained how DFSS can contribute in these factors in order to achieve business excellence. Because the time limit, this is the very minimum benefit of DFSS, there are still many factors we haven't discovered. Hope we will find out more through the study week, and learn some more practical activities.

DFSS approach is for design new product or process and aim to presentation of problem and take proactive activity. It is a step before Six Sigma and other excellence models. It takes holistic approach of re-engineering rather than a technique to complement Six Sigma. DFSS is a way to exceed customer expectations, which means build customer demand into to the production and product design process. Therefore the outcome can achieve excellent quality at the first time. The smaller the gap between customer demand and their expectations, the less reactive activities needed afterwards.

June 2023

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