100% inspection
Every single unit is checked. Best for small batches, high-value items, critical functions.
Volume 14, Chapter 2
Inspections: How Many, and When
1
Definition
Imagine a small stitching flaw is missed. It travels from the workshop, through packaging, into a delivery box, into a customer's hands. She notices it a week later, after wearing the garment once. What would have cost three minutes to fix at the cutting table now costs a full refund, a returned order, and a customer who tells her friends not to order from this shop again.
An inspection point
is a defined moment in production where output is checked against Chapter 1's quality standard before it's allowed to move further.
Why does it matter exactly where something gets checked, not just whether it eventually gets checked at all? Because the same flaw doesn't cost the same amount everywhere along the line. Fix it in raw fabric and it costs a metre of cloth. Fix it after a customer has already worn the garment and it costs the sale, the trust, and the redo. Inspection points exist to catch problems while they're still cheap.
In One Sentence
The single biggest lever in quality control isn't a stricter standard, it's catching a problem earlier. The same flaw costs almost nothing to fix at the raw-material stage and can cost the entire sale, plus reputation, once it reaches a customer.
2
The Escalating Cost of Catching It Late
| Stage Caught | Typical Cost to Fix |
|---|---|
| Incoming materials | A metre of unusable cloth, rejected before it's even cut |
| In-process | Time and materials already invested, but before final assembly |
| Final inspection | A fully finished item, full labour and material cost at risk |
| After delivery | The sale, a refund, damaged trust, and the cost of redoing it |
Memory Trick
The earlier a defect is caught, the cheaper it is to fix. A flaw caught at the fabric stage costs a metre of cloth; the same flaw caught after delivery costs the sale, the reputation, and the redo.
3
How Much to Inspect
Sampling
A fair sample of the batch is checked. Best for large batches, where checking every unit isn't practical.
Spot checks
Unannounced checks on specific items or workstations. Best for deterring drift from the standard between full inspections.
This mirrors Volume 13, Chapter 2's counting methods almost exactly, full counts, rotating checks, and spot checks, applied to quality instead of quantity.
4
Why the Inspector Shouldn't Be the Maker
Just as Volume 11's purchase triangle keeps ordering, receiving, and paying separate, a final inspection carries more weight when it isn't performed solely by the person who made the item. Not because makers are dishonest, but because nobody reliably catches their own blind spots at the same rate an independent check does.
5
Example Story: The Inspection Point That Was Missing
Here's the full version of the missed-flaw story from the start of this chapter.
MANIAC MINDZ's only quality check at the time was a quick final glance before packaging. A stitching defect slipped past it, reached a customer, and came back as a full refund and a damaged relationship.
One new inspection point was added, held by someone other than the person doing the sewing, checking mid-production instead of only at the end. It caught the same category of defect twice in its first month alone. Each catch cost a few minutes. Neither one cost a refund.
6
Across Industries
Every business has its own version of "the cutting table", an early point where a flaw is still cheap to catch.
| Business | Their Inspection Points |
|---|---|
| Golden Crust Bakery | Ingredient freshness on arrival, dough consistency mid-process, appearance before display |
| Rapid Auto Works | Parts check on arrival, mid-repair tightness checks, final road test |
| Precision Print & Press | Paper stock check, first-proof colour match, final count and binding check |
7
Common Mistakes
Common Mistake #1: Only Inspecting at the Very End
By far the most expensive place to catch a problem, see Section 2.
Common Mistake #2: The Maker Is the Only Judge of Their Own Work
Removes the independent check described in Section 4.
Common Mistake #3: No Defined Sampling Rate
"Check some of them sometimes" isn't a method, it's a guess, and it guarantees inconsistent coverage.
8
Quiz Yourself
Quiz 1
Why does catching a defect at the incoming-materials stage cost so much less than catching it after delivery?
Because no labour, assembly, or delivery cost has been invested yet, the loss is limited to the raw material itself, rather than the full finished cost plus the sale, trust, and rework.
Quiz 2
Name the three inspection-quantity methods from Section 3.
100% inspection, sampling, and spot checks.
9
Practice Exercise
Map your own production process and mark every point where quality is currently checked. Identify the single earliest stage where a defect could be caught but currently isn't, and add an inspection point there.
10
Quick Summary
Quick Summary
- Catching a defect earlier is always cheaper than catching it later, often dramatically so.
- Inspection quantity has three main methods: 100% inspection, sampling, and spot checks.
- A final inspection is stronger when it isn't performed solely by the item's own maker.
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