In one line: A matrix that translates what customers want into the engineering characteristics that deliver it, shows how strongly each one matters, and exposes the trade-offs between them.
Core idea
Quality Function Deployment (QFD) is a method for designing customer satisfaction into a product, rather than fixing problems after launch. It originated in Japan in the 1960s and was famously used by Mitsubishi Heavy Industries in 1972 to plan an oil tanker. It reached U.S. industry in the 1980s. Its best-known artifact, the House of Quality, was popularized for Western managers by John Hauser and Don Clausing [1]. Clausing later taught at MIT, where he held a professorship named for Bernard Gordon.
How it works
The “house” is named for its shape:
flowchart TB R["Roof: correlations between engineering characteristics<br/>(where improving one hurts another)"] M["Body: customer needs (rows) × engineering characteristics (columns)<br/>with relationship strengths"] L["Left: customer needs and their importance"] Ri["Right: customer perception of us vs. competitors"] B["Basement: targets, units and technical benchmarks"] R --- M L --- M M --- Ri M --- B
- Whats: list customer needs in their words, with importance weights (see Voice of the Customer).
- Hows: list measurable engineering characteristics that could satisfy them.
- Relationships: mark how strongly each characteristic affects each need. Blank rows reveal unmet needs; blank columns reveal characteristics nobody asked for.
- Competitive assessment: rate how customers see your product against competitors on each need.
- Roof: mark positive and negative correlations between characteristics, which are the built-in trade-offs.
- Targets: set target values and units for each characteristic, informed by everything above.
The same “whats → hows” logic can cascade: the hows of one house become the whats of the next (parts, then processes, then production).
In practice
In the program’s skills lab, teams build a house from scratch for a deliberately humble problem, getting rid of rodents. Even that shows how quickly a team discovers it disagrees about what customers want and which characteristics matter. The real value of QFD lies less in the finished matrix than in the cross-functional conversation it forces among marketing, engineering and manufacturing. Clausing listed the obstacles it targets: poor understanding of customers, failure to prioritize, unmanageable risk, unbuildable designs, overreliance on formal specifications, and tests that miss key defects.
Questions to ask yourself
- Can I trace each of my design’s key specifications back to a customer need?
- Which characteristic on my product fights another, and who decides the balance?
- Where do customers rate us lower than a competitor on something they care about?
Connections
- Inputs: Voice of the Customer, Identifying Customer Needs. Outputs: Product Specifications.
- The roof is a map of Trade-off Analysis. Quality philosophy: Total Quality Management.
- Capabilities exercised: Connecting Across Disciplines, Decision Making, Inquiry.
Sources
- Hauser and Clausing (1988) The House of Quality [1]
- Course module and skills lab on quality function deployment.