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Sample inspection vs every-piece photo QC: what each one can and cannot tell you.
Sampling is a sound statistical method. But it answers a question about the lot, not about the piece a customer complains about.
| Sample inspection | Every-piece photo QC | |
|---|---|---|
| What is checked | A sample drawn from the lot | Every piece |
| Who must be present | An inspector at the unit | A trained photographer at the line; QA reviews remotely |
| Evidence | An inspection report for the lot | Photos and measurements per piece |
| Bad piece in a passed lot | Can still ship | Blocked at packing and loading |
| Answering a complaint | Lot-level record only | Look up the piece by barcode |
| Effort per piece | Low | A few photos per piece |
Which to use
- Sampling suits high-volume, low-value items where a few defects are acceptable and individual traceability is not needed.
- Every-piece evidence suits higher-value, dimension-critical or made-to-order pieces, and products where complaints are frequent or costly.
- Many brands combine them: every-piece photo checks for dimensions and labels, plus periodic visits to audit the partner’s process.
An example
Restaurant table tops made to order in several sizes are a poor fit for sampling: a wrong-size top in a passed lot still reaches a restaurant. Every-piece photo QC catches it at the line. For context, read OEM quality control.
How AutoQC does it
AutoQC gives every piece one barcode, printed in bulk from the purchase order and stitched or fixed to the piece at the OEM unit. A QC photographer then takes four photos in a locked order (length, width, height at the barcode, and the MRP label on the pack) with the tape readable and the barcode in frame, guided in Hindi and English. Each measurement is checked against the spec and its tolerance. Brand QA reviews the evidence from anywhere and passes, sends back for redo with a reason, or holds the piece. Only a piece in the “QC passed” state can be packed, labelled or scanned onto the truck; anything else is refused at loading. Every photo is stamped with barcode, user, location and time, and each piece has a one-page evidence PDF with the PO, SKU, OEM unit, photographer, reviewer and dispatch truck.
Questions
Is 100% inspection better than sampling?
Not always. Sampling is efficient for high-volume, low-value goods. Every-piece inspection suits higher-value or dimension-critical pieces where one bad piece is costly.
Can every piece be inspected without an inspector at the unit?
Yes, if a photographer at the line captures measurement and label photos for each piece and QA reviews them remotely.
Should sampling be dropped completely?
Many brands keep process audits and visits alongside every-piece photo checks.
See it on your own data. AutoQC — Every piece proves itself. Book a 30-minute working session with an engineer.