Do defects really matter?
Is 99.9% an acceptable tolerance for defects? Consider:
- Drinking water contaminated for 1 hour per month
- 16,000 letters lost every day by the Post Office
- 2 accidents per month at Mexico City International Airport
- 20,000 prescriptions in error each year
- 50 babies dropped on the delivery room floor each hour
- 22,000 checks drawn from the wrong account per hour
