Zero Defect

Zero Defect Goal is a quality philosophy targeting the complete elimination of defects through prevention rather than detection, emphasizing "do it right the first time."

## What Is the Zero Defect Goal?

• Origin: Philip Crosby, 1960s quality movement
• Principle: Defects are unacceptable, not inevitable
• Focus: Prevention systems over inspection
• Measurement: Cost of quality (COQ) as key metric

## Why Zero Defect Matters

In semiconductor manufacturing, even 0.1% defect rates translate to thousands of failed chips. Zero defect mindset drives continuous improvement.

Defect Cost Escalation:
Stage           | Cost to Fix
----------------|-------------
Design          | $1
Wafer Fab       | $10
Test            | $100
Assembly        | $1,000
Field Return    | $10,000+

Prevention at design = 10,000× savings vs. field fix

Zero Defect Implementation:
- Define requirements precisely (no ambiguity)
- Build prevention into processes (poka-yoke)
- Measure and track defects obsessively
- Root cause analysis for every defect
- Continuous process improvement (Kaizen)