Can supplier training be delivered online only?

A: Standards can. Judging physical parts cannot; the blind round needs three people in one room on the same five cases.

Are drawings and a specification enough?

A: No. Drawings fix shape, the spec fixes items, the golden sample fixes the boundary, the atlas carries experience, the card works at the machine.

Is an 85-point pass mark unrealistic?

A: Not against reliability. Sixty points leaves a 40% error rate, and three wrong calls in a 500-piece batch outrun the session cost.

If the supplier retrains internally, does the buyer stay involved?

A: Check coverage and records: one session, 100% of relevant roles, an attendance sheet, a teach-back score.

What if the defect rate does not fall?

A: Audit the drawing revision and the golden sample first, then whether the assessment was softened. The 2 points in 30 days is a target, not an acceptance line.

Supplier Training

Quick answer: Supplier training moves the buyer's decision limits to the supplier's inspectors, not a folder of files: four hours, five items, 85 points.

Transfer the decision, not the documents
Three audiences, one hour table
Five teaching items, each with one job
Three gates and an 85-point line
Refresher cadence and the 30-day read
FAQ

1. Transfer the decision, not the documents

Three batches came back rejected inside one month at a plant in eastern China. The supplier could mould the case; it could not agree a flash limit. Its inspector used an older card allowing 0.30 mm against a buyer limit of 0.15 mm. Both applied a rule correctly; only half the rule had been transferred.

Supplier training fails in two familiar ways. A drawing pack, a specification and a golden sample go out by email asking for compliance. Or twenty people sit through two hours of slides and sign an attendance sheet. Neither leaves a decision anyone can repeat at the bench.

What changes hands is narrower: five teaching items, three defect classes with agreed limits, one record format. What comes back is narrower still: pass results for three roles and one retraining record.

The only acceptance test that matters is agreement. Give the same case to the supplier's inspector and to yours, then compare the two verdicts.

2. Three audiences, one hour table

Split the room by role. Incoming inspectors need the boundary between pass and reject. Moulding shift leaders need the link between parameters and appearance. Packers need the handling rules that stop scuffs and crush damage. Teaching all three together is the most common waste in the programme.

Supplier training walk-through in an injection shop: tan resin sacks stacked on an orange pallet beside a grey machine, white sacks on the right

Audience	Hours	Assessment	Pass mark	Retraining duty
Incoming inspector	240 min	20 written items, 10 physical parts	85	Train one backup
Moulding shift leader	180 min	10 physical parts, parameter Q&A	85	15 min at shift start
Packer	90 min	5 blind parts	85	One live demonstration
Internal trainer	240 min	20 min teach-back	85	Cover 100% of relevant roles

Four hours break into three blocks: 90 minutes on drawings and limits, 90 minutes judging real parts at the bench, 60 minutes for questions and retakes. The middle block is done standing; past 90 minutes of seated listening, attention collapses to the attendance sheet.

Cap each session at 20 people with two trainers, one on standards and one on parts. Beyond that the queue at the bench gets long, and by the fifteenth pair of hands the flash on the sample has been rubbed smooth.

Start with three suppliers, not thirty; three expose about 80% of the material defects — photographs unreadable under workshop lighting, colour patches printed slightly off, a card too large to hang.

3. Five teaching items, each with one job

Five items are enough, provided each answers a question the others cannot.

Item	Form	Maintained by	Refresh
Drawing	Controlled PDF, two revisions side by side	Buyer engineering	5 working days after change
Inspection spec	Items, frequency, verdict	Buyer quality	Reviewed every 12 months
Golden sample	Two physical units, three signatures	Buyer quality	Resigned after major tool repair
Defect atlas	40 photographs in three classes	Buyer quality	5 added per quarter
Decision card	One per workstation, hung at the machine	Supplier	Follows the spec

Ship two drawing revisions, never one. A single current revision forces the supplier to rebuild the difference from memory, and memory is where the 0.30 mm figure came from. Write frequency as an interval — every 2 hours, five parts — because every batch in practice means never.

The golden sample never enters the classroom and still decides most arguments. Expire it or lose it and the other four items lose their reference point.

The decision card carries three lines — where to look, how much is too much, who to call.

4. Three gates and an 85-point line

Nothing counts as transferred until it is assessed, and the three gates cover different failures. A written test checks recall, physical parts check the hand, a blind round checks agreement between people.

Supplier training debrief at a shop corner: yellow steel frame around a hopper dryer and black hoses, a green drum and stacked resin sacks

The paper runs 20 items in 45 minutes on drawing symbols, defect classes and record filling, half true-or-false, half multiple choice. The physical round uses 10 parts, three of them borderline; one wrong verdict there costs 10 points.

The blind round matters most. Five parts, no answers, three inspectors judging independently, then a comparison. Two disagreements out of five means the standard has not landed, so the fix is more teaching rather than another test.

Set the pass mark at 85, not 60. Sixty implies 40% of verdicts are unreliable, and on a 500-piece batch three wrong calls cost more in return freight than the session.

Allow one retake within 7 days, then replace the person; an assessment without an exit passes everyone.

5. Refresher cadence and the 30-day read

Refresh every 12 months, with two earlier triggers: two rejected batches from the same supplier within 3 months, or a structural drawing change. Either pulls the refresher forward to 30 days.

Online is the second format, a 45-minute recording for new hires and revision. It cannot replace the bench session: judging a physical part does not survive a screen.

Read the data 30 days later. The working target is a 2-point drop in incoming defects, for example 4.8% to 2.8%, given as a range and never as a guarantee. When it does not move, check the drawing revision and the golden sample first.

Keep six records: attendance, papers, physical scoring sheets, blind-round agreement, retakes, retraining log. Six make one session, filed for 3 years.

The supplier then runs one internal session, taught by whoever passed, with the buyer welcome to observe and not to score. Coverage counts against relevant roles and targets 100%; packers are the usual gap.

Conclusion

Supplier training moves five teaching items, three defect classes and one record format to the supplier's bench. Four hours in three blocks, three audiences taught separately, three gates at 85 points and a 12-month refresher keep verdicts aligned; the 30-day read shows whether they stayed aligned.

This article covers case-side specifications only and does not address any handling, loading or use of the contents.