Critical to Quality (CTQ): Understand What Matters Most to Your Customer

What is Critical to Quality (CTQ)?

Critical to Quality refers to the measurable product or service characteristics that are most important to customers.

It helps manufacturers convert customer expectations into specific quality requirements that can be measured and controlled.

Simple Factory Example

A company manufactures electrical connectors.

Customers expect:

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• Correct dimensions.
• Strong electrical connections.
• Proper insulation.
• Reliable performance.

The quality team converts these expectations into measurable CTQ requirements:

• Connector width: 10 ± 0.2 mm.
• Contact resistance: Within the specified limit.
• Insulation resistance: Meets the required specification.
• Connection strength: Above the specified minimum.

Why does CTQ matter?

• Connects customer expectations with production requirements.
• Helps identify important product characteristics.
• Supports inspection and quality control.
• Reduces customer complaints.
• Helps prioritize improvement activities.

How to Identify CTQs

1. Understand customer expectations.
2. Identify the product features that affect customer satisfaction.
3. Convert those features into measurable specifications.
4. Define inspection methods and acceptance criteria.
5. Monitor the results during production.

Important Insight

Not every product characteristic has the same importance.

A minor cosmetic variation and an electrical safety failure should never receive the same priority.

Practical Insight

Don’t just ask whether a product meets the drawing.

Ask whether it meets the characteristics that matter most to the customer.