QFD Online

…moving into the House of Quality

Archive for the 'House of Quality' 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.

Read the rest of this entry »

Category: House of Quality, Advice, DFSS, Lean Six Sigma, Quality Function Deployment, QFD | 9 Comments »

The Psychology of Notation

January 10th, 2009 by James Grover

Symbolic and Numeric RatingsThere has been much debate over which representation is the best to use when filling in the ratings for a House of Quality: symbolic notation or numeric notation. The premise behind the debate is that there is somehow a greater inherent value in using circles, filled circles, and triangles or in using 1’s, 3’s, and 9’s. In actuality, neither format is universally superior to the other. On the contrary, they both serve different purposes and are uniquely suited for working with different groups. Thus, just as it is important to tailor a speech or written argument to the needs of the intended audience, it is important to choose the notation for a QFD that is best suited for its target audience.

Read the rest of this entry »

Category: House of Quality, Advice, Quality Function Deployment, QFD | 1 Comment »

It All Depends

December 22nd, 2008 by Peter Wolfe

PERT ChartI still remember the Brady Bunch episode in which Greg talked his parents into remodeling their attic into his bedroom (after a fight with Marcia over whose room it should be). From the moment I first saw that show, I dreamt of overhauling my parents’ attic. Today, many engineers are doing just that–-repurposing their attics and making better use of them. However, the attics which I am referring to are not in their homes, but rather in their Quality Function Deployment matrices (i.e. “Houses of Quality”). Although many customizations have been made to the QFD “roof”, my favorite modifications is the addition of the “dependency” concept.

Read the rest of this entry »

Category: House of Quality, Remodeling the HOQ™, Agile, Quality Function Deployment, QFD, TRIZ | 2 Comments »

Blending the Voices of Disparate Customers

August 27th, 2008 by James Grover

Choir singingSeveral months ago I published an article entitled “Who’s Your Daddy” which discussed why it is imperative to listen to the disparate (and sometimes contradictory) voices of different customers. Since that time, I have received several inquiries about the mechanics of exactly how one blends the voices of conflicting business, consumer, and regulatory groups into a single “VOC” for a Quality Function Deployment. The intent of this article is to answer those inquiries by giving an overview of the two primary processes for blending the requirements from these disparate groups, namely: “Percentage Translation” and “House of Quality Folding”.

Read the rest of this entry »

Category: House of Quality, Advice, Voice of the Customer, Remodeling the HOQ™, Quality Function Deployment, QFD | 1 Comment »

Saving Time by Voting Blind

May 10th, 2008 by James Grover

businessman with his hands over his eyesThe Quality Function Deployment (QFD) process is probably the most effective methodology available for capturing and responding to the “voice of the customer”. Few people dispute the effectiveness of QFD, but many people express concerns about its efficiency. Although the tools of QFD are extremely valuable for prioritizing product and/or service development efforts, they can be arguably cumbersome. In fact, many management teams that implement a QFD process end up abandoning it after a few months due to the time requirements of following such a rigorous methodology. Although the time saved by reducing unnecessary course corrections far outweighs the additional overhead of implementing Quality Function Deployment, there is definitely a significant upfront time investiture associated with the process. However, there are several time saving procedures that QFD teams can utilize to significantly decrease the arduousness associated with the methodology. One particularly beneficial time saver is that of “voting blind”.

Read the rest of this entry »

Category: House of Quality, Advice, Voice of the Customer, Quality Function Deployment, QFD | 3 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…

Read the rest of this entry »

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

What’s the Use?

March 31st, 2008 by John Livingston

Swiss Army KnifeI have been asked on several occasions what industries Quality Function Deployment (QFD) is useful for. My tongue-in-cheek response to such inquiries is that “QFD is only useful for those industries that have decisions to make and customers to please”. In all seriousness, QFD is about communication and decision making, and its tools can truly be used in any industry. The House of Quality matrix, in particular, is an almost universal tool that can be used for prioritizing anything from a family budget to the complex engineering tasks of an automobile manufacturer.

Read the rest of this entry »

Category: House of Quality, Voice of the Customer, Quality Function Deployment, QFD | 2 Comments »

Where Did QFD Get Its Terrible Name?

January 5th, 2008 by James Grover



What’s in a name? While Shakespeare may have been correct in observing that “that which we call a rose by any other name would smell as sweet”, most people would not know what you were talking about if you referred to it as a “bee leaf pollen perch”.

Similarly, the name “Quality Function Deployment” gives little hint as to what the tool actually is or what purpose it serves. So why is its name so perplexing? The answer lies in two main issues…

First, “Quality Function Deployment” was originally created by two Japanese professors back in the 1960’s (Drs. Yoji Akao and Shigeru Mizuno). Thus, the process was originally given a Japanese name, which was later translated into English. The original Japanese name, “Hin-shitsu Ki-no Ten-kai”, was translated quite litterally into the name “Quality Function Deployment”. Although the name supposedly carries with it a more intuitive meaning in Japanese, it doesn’t seem to have the same readily apparent meaning in English.

Additionally, the term “QFD” is used by many people today to refer to a series of “House of Quality” matrices strung together to define customer requirements and translate them into specific product features to meet those needs. However, these prioritization matrices were only a small part of the system that Drs. Akao and Mizuno originally created. (See “What is the House of Quality? Why it isn’t a QFD?” at qfdi.org for more information on this topic.) Thus, the application of the term “QFD” has changed over the course of the past 30+ years as well. Even though much was lost in translation from its Japanese name, “Quality Function Deployment” was a much more apropos name for the system of processes originally created by Akao and Mizumo than it is for the derivative tool that it has come to refer to today.

Category: History of QFD, House of Quality, Quality Function Deployment, QFD | 8 Comments »

When to Say When

October 9th, 2007 by James Grover

A comment was recently submitted to QFD Online regarding the limits that should be imposed on the number of requirements for any given House of Quality. The basic premise of the comment was that the number of requirements should be limited in order to keep the HOQ “maintainable”. While the core principle was accurate (i.e. that it requires care and attention when crafting a QFD in order to make sure that it can be maintained long-term), the idea that there is a one-size-fits-all limit that can be used is misguided. Luckily, however, there are processes and procedures that can be applied on a case-by-case basis to ensure maintainable requirement lists.

Read the rest of this entry »

Category: House of Quality, Advice, Agile, Quality Function Deployment, QFD | 2 Comments »

Heading in the Right Direction

September 30th, 2007 by Peter Wolfe

Have you ever watched a team of engineers modifying their secondary requirements (a.k.a. the “quality characteristics hierarchy” or “hows”) on a House of Quality spreadsheet? They remind me of a group of hillbillies staring at a piece of modern art—their heads are usually cocked to the side with grimaced looks on their faces. (It’s quite entertaining actually.) Considering that in a spreadsheet environment secondary requirements are generally edited far more than primary requirements (the primary requirements list or “demanded quality hierarchy” is usually pulled automatically from other Houses of Quality in the QFD), have you ever wondered why it is that the secondary requirements are the ones that are flipped on their sides and run across the top of the HOQ?

Read the rest of this entry »

Category: House of Quality, Advice, Remodeling the HOQ™, Quality Function Deployment, QFD | 2 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”.

Read the rest of this entry »

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