House of Quality (HOQ)

Introduction: HOQ

The House of Quality (HOQ) is the central tool in Quality Function Deployment (QFD), a structured method that translates customer needs into clear technical requirements. Widely used in product design and process development, it ensures that customer expectations are built directly into products and services.

Background

Originating in Japan in the 1960s, the HOQ was popularised by Toyota as part of its quality management practices. It is called a “house” because its matrix structure resembles the shape of a house, with a roof, walls, and foundation. The HOQ quickly became a global standard in industries where customer satisfaction and quality are critical.

Key Elements/Features

• Customer Needs (“Whats”): Listed on the left side, these represent what customers expect, gathered through research and feedback.
• Technical Requirements (“Hows”): Placed across the top, these outline the design and engineering specifications that respond to customer needs.
• Relationship Matrix: The central area connects customer needs with technical requirements, showing the strength of each relationship.
• Roof of the House: Shows correlations among technical requirements, highlighting synergies or conflicts.
• Prioritisation: Customer needs are weighted, ensuring the most critical requirements are addressed first.

Applications/Examples

• Automotive: Toyota and other carmakers use HOQ to link customer demands (e.g., safety, fuel efficiency) with design parameters.
• Electronics: Mapping customer expectations like durability and speed to technical features.
• Service Design: Aligning customer service expectations with internal process standards.

Relevance/Impact

The HOQ fosters cross-functional teamwork, ensuring marketing, engineering, and operations collaborate on meeting customer needs. It improves decision-making, reduces conflicts in design, and prioritises what matters most to customers. As a result, products and services deliver higher value, improving both satisfaction and competitiveness.

See also

• Quality Function Deployment (QFD)
• Voice of the Customer (VOC)
• Design for Six Sigma (DFSS)
• Kano Model