The following House of Quality (QFD) example gives a simple overview of the intended use of a House of Quality matrix and demonstrates how successive HOQs flow into one another, facilitating the Quality Function Deployment process.
This particular QFD example was created for an imaginary Chocolate Chip Cookie Manufacturer (a.k.a. a “Bakery”). The example maps customer requirements to parts/materials to be purchased in order to meet and/or exceed the customer expectations. (The prioritization comes into play when assuming limited availability of funds for making purchases.)
Chocolate Chip Cookie QFD Example
While reviewing the example, you may wish to note the following:
- The QFD ends with HOQ #3. This is due primarily to the fact that all of its parts/materials are purchased rather than manufactured. Had a different product been chosen, a 4th HOQ could have been added that mapped parts/materials attributes to processes and/or initiatives for manufacturing the parts that met those specifications.
- The “Weight” requirement (column #4) in HOQ #1 may not be a valuable requirement. You can tell that this requirement is suspect by the fact that its “Max Relationship Value in Column” is only 1. (Note: the template auto-highlights warning values.)
- The “Weight” requirement (row #4) in HOQ #2 is not being addressed. Similarly, “Tensile Ultimate Strength” (Row #3) and “Size (diameter)” (Row #5) are not being substantially addressed. (Note their “Max Relationship Value in Row” values.)
- HOQ #3 has examples of both of the issues listed in #1 & 2 above.