How to Use Defect Classification (Critical, Major, Minor) in Inspections

The 5-point quality control system is the industry standard for China manufacturing. Point 1: Raw Material QC — verify incoming materials against specifications before production. Point 2: In-Process QC — inspect during production, not just at the end. Point 3: Pre-Shipment QC — random sampling before container loading. Point 4: Loading Supervision — confirm quantity, packaging, and marks. Point 5: Corrective Action — when defects are found, ensure the factory implements permanent fixes, not quick patches.

The cost of quality follows the 1-10-100 rule. A defect caught at design costs $1 to fix. Caught during production, it costs $10. Caught after shipment, it costs $100 or more. This is why pre-production inspection is the highest ROI quality activity. Spending $400 on PPI for a $20,000 order is a 2% investment that protects the remaining 98%. Most importers underinvest in early-stage quality and pay for it later.

Inspection sampling should be genuinely random. A common factory trick is preparing perfect units on top of pallets while concealing defects in the middle. Professional inspectors break down stacks, sample from inner cartons, and mix their own selection rather than using pre-staged samples. Instruct your QC team to be unpredictable in their sampling pattern. Random sampling is only valuable if it's actually random.