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Archive for the 'DFSS' Category

Do We Need a Matrix for QFD?

January 21st, 2011 by Dr. Thomas M. Fehlmann

QFD Matrix

During the last years a tendency has been observed to position QFD more towards understanding customer’s needs than doing complex matrix mathemagics with insecure data and producing fuzzy evaluation profiles. It is more important saving (customer’s) time than understanding relationships between process controls and process response.

Customer’s needs can be analyzed by means of Thomas Saaty’s Analytic Hierarchical Process (AHP), prioritized with ratio scales, and assessed for consistency. This seems much quicker and more reliable than assessing the Voice of the Engineers, and then trying to understand how it transforms into something that meets Voice of the Customer’s requirements.

However, this opinion stands in contrast to the Six Sigma approach, used to define, measure, analyze, improve, and control (DMAIC) relationships between process controls and process responses. Such relationship mapping is called Transfer Function. For instance, a transfer function describes how to transform controls used by engineers into response expected by customers. If there are more than one response characteristics, and more than one control impacts the response, the QFD matrix is the natural choice for representing the transfer function.

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Category: House of Quality, Advice, DFSS, Lean Six Sigma, Quality Function Deployment, QFD | 7 Comments »

Planning for Failure: HOQ vs. FMEA

April 29th, 2008 by Peter Wolfe

Chain about to breakYou’ve probably heard the old adage, “If you fail to plan, then you’re planning to fail.” That sentiment is certainly echoed in the basic principles of the Quality Function Deployment (QFD) methodology. There is another old adage concerning failure that, although not quite as recognized, is just as true: “Fail to mitigate failure and you will succeed in minimizing success.” (Okay, so it isn’t really an old adage. I just made it up. However, you have to admit, it does sound rather catchy, and it does convey the underlying precept fairly well.) This maxim (regardless of how it is worded) is similarly echoed by the tenets of Quality Function Deployment.

So then, the question arises–what is the best tool for prioritizing steps to mitigate potential failures: Failure Mode and Effects Analysis (FMEA) or the House of Quality (HOQ) tool? Coming from a Quality Function Deployment enthusiast, my answer may surprise you…

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Category: History of QFD, House of Quality, Advice, Voice of the Customer, DFSS, Quality Function Deployment, QFD, CTQ, CTC, FMEA | 18 Comments »

This Old House…of Quality

August 23rd, 2007 by Peter Wolfe

In 1979, a PBS station in Boston called “WGBH” aired a one-time, 13-part series entitled “This Old House”. Since that time, the program has grown to become one of PBS’s most popular programs, has generated spin-offs, produced a popular magazine, spawned a for-profit website, and even inspired sitcoms.[1] And why has this program been so successful? In my opinion, it’s because people have an inherent love for taking something great, stripping away its faults, and putting it to new found use. That is the same explanation that I use when people ask me about Quality Function Deployment’s resurgence in popularity during recent years. In short, when people ask me why QFD has experienced so much growth in adoption, my answer is simply: “This Old House…of Quality”.

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Category: House of Quality, Remodeling the HOQ™, DFSS, Lean Six Sigma, Quality Function Deployment, QFD | 1 Comment »