House of Quality

This house of quality sample illustrates correlation matrix.
It was designed on the base of the figure 3-5 in Lecture "How QFD helps in product quality improvement?" from the website of National Programme on Technology Enhanced Learning (NPTEL), India. [nptel.ac.in/ courses/ 110101010/ downloads/ mod3/ Module%20 III-Lec1.pdf]
Distributed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) [creativecommons.org/ licenses/ by-sa/ 4.0/ ]
"After drafting the relationship matrix, it is evaluated for any empty row or column. An empty row indicates that a customer voice is not being addressed by any technical descriptors. Thus, the customer expectation is not being met. Any blank column indicates that the technical requirement is unnecessary, as it does not address any VOC.
The roof of the house of quality, expressed as correlation matrix, is used to identify any interrelationships between the technical descriptors (Figure 3-5). Symbols are used to describe the strength of the interrelationships. Symbols generally preferred are:
- A ‘solid circle’ represents a strong positive relationship.
- A ‘circle’ represents a positive relationship.
- An ‘X’ represents a negative relationship.
- An ‘asterisk’ represents a strong negative relationship." [nptel.ac.in/ courses/ 110101010/ modules/ module3/ lec1/ 1.7.html]
The HOQ example "House of Quality - correlation matrix" was designed using ConceptDraw PRO software extended with House of Quality solution from Quality area of ConceptDraw PRO Solution Park.

This house of quality sample illustrates interrelationship matrix.
It was designed on the base of the figure 3-4 in Lecture "How QFD helps in product quality improvement?" from the website of National Programme on Technology Enhanced
Learning (NPTEL), India. [nptel.ac.in/ courses/ 110101010/ downloads/ mod3/ Module%20 III-Lec1.pdf]
Distributed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) [creativecommons.org/ licenses/ by-sa/ 4.0/ ]
"The next step in building a house of quality is to compare the VOC with technical characteristics and determine their interrelationships. In this context, engineering knowledge about the product and historic evidence/ data can provide useful information. Common practice is to use symbols to represent the nature of relationship between customer requirements and technical descriptors. Symbols used are:
- A solid circle represents a strong relationship (scored as +9).
- A single circle represents a medium relationship. (scored as +3).
- A triangle represents a weak relationship (scored as +1).
- The box is left blank if there is no relationship between VOC and technical characteristics.
Figure 3-4 provides the interrelationship matrix with type of relationships. Any cell that is empty implies no or insignificant relationship." [nptel.ac.in/ courses/ 110101010/ modules/ module3/ lec1/ 1.6.html]
The HOQ example "House of Quality - interrelationship matrix" was designed using ConceptDraw PRO software extended with House of Quality solution from Quality area of ConceptDraw PRO Solution Park.

This house of quality sample illustrates VOC vs. technical requirements.
It was designed on the base of the figure 3-3 in Lecture "How QFD helps in product quality improvement?" from the website of National Programme on Technology Enhanced
Learning (NPTEL), India. [nptel.ac.in/ courses/ 110101010/ downloads/ mod3/ Module%20 III-Lec1.pdf]
Distributed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) [creativecommons.org/ licenses/ by-sa/ 4.0/ ]
"As the customer needs and expectations are expressed in terms of customer requirements, the QFD team needs to come up with engineering characteristics (HOW’s) that will affect one or more of the customer requirements. Each engineering characteristic must directly affect a customer perception (VOC) and be expressed in measurable terms.
Implementation of the customer requirements in design is difficult until they are translated into counterpart technical characteristics. Counterpart technical characteristics are an expression of the voice of the customer in technical language and specifications. For example, a customer requirement for an automobile might be a smooth ride. This is rather an abstract statement, which is important from the point of view of selling an automobile. Technical characteristics for a smooth ride can be appropriate dampening, anti-roll, and stability requirements. These are the primary technical descriptors or characteristics. Engineering knowledge and brainstorming among engineering staff’s is a suggested method for determining technical characteristics. Figure 3-3 shows the different technical requirements which can address all VOC for the bike stem design." [nptel.ac.in/ courses/ 110101010/ modules/ module3/ lec1/ 1.5.html]
The HOQ example "House of Quality - VOC vs. Technical Requirements" was designed using ConceptDraw PRO software extended with House of Quality solution from Quality area of ConceptDraw PRO Solution Park.

This house of quality matrix sample was designed on the base of the Wikimedia Commons file: House of Quality.jpg.
[commons.wikimedia.org/ wiki/ File:House_ of_ Quality.jpg]
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license. [creativecommons.org/ licenses/ by-sa/ 4.0/ deed.en]
"Quality Function Deployment (QFD) uses a matrix format to capture a number of issues that are vital to the planning process. The House of Quality Matrix is the most recognized and widely used form of this method. It translates customer requirements, based on marketing research and benchmarking data, into an appropriate number of engineering targets to be met by a new product design. Basically, it is the nerve center and the engine that drives the entire QFD process." [Tapke, Jennifer; Muller, Alyson; Johnson, Greg; Siec, Josh. "House of Quality: Steps in Understanding the House of Quality" (PDF). IE 361. Iowa State University. www.public.iastate.edu/ ~vardeman/ IE361/ f01mini/ johnson.pdf]
The HOQ example "House of quality" was designed using ConceptDraw PRO software extended with House of Quality solution from Quality area of ConceptDraw PRO Solution Park.