What does a PSI checklist include?

Question

Accepted Answer

Short Answer: Quantity, Appearance, Dimensions, Function, Labelling, Packaging and AQL Classification

Direct Answer

A thorough pre-shipment inspection checklist covers seven areas: unit and carton quantity against the purchase order, appearance and workmanship, dimensions and weight against the approved specification, functional testing of every feature, labelling and barcodes, inner and outer packaging, and defect classification under an agreed AQL standard.

The Seven Areas in Order

Each area targets a distinct failure mode. Omitting one is how a shipment passes inspection and still fails on arrival.

Area	What is checked	Common failure
Quantity	Units and cartons against the PO	Short-pack inside cartons
Appearance	Scratches, dents, paint, logo alignment, colour consistency	Colour variance between lots
Dimensions and weight	Measured against the approved spec	Drift from the golden sample
Function	Every feature per the spec sheet	Untested secondary features
Labelling and barcodes	Origin, materials, care, scannable codes	Non-scanning or wrong-market labels
Packaging	Inner and outer carton, shipping marks, drop readiness	Cartons that fail in transit
AQL classification	Critical, major and minor counts	Defects recorded without classification

An inspector working through a printed checklist beside product samples — Seven areas, each targeting a distinct failure mode.

Write the Checklist Yourself

This is the single highest-leverage habit in quality control and almost nobody does it. A generic checklist finds generic defects; yours finds the ones that matter for your market and your customers.

List your product's specific failure pointsThe things that have gone wrong before, or that reviewers complain about.

State tolerances as numbersPlus or minus millimetres and grams, not the word 'correct'.

Specify the market requirementsPlug type, voltage, language on packaging, required marks.

Define what counts as a defect for youA scratch acceptable on a tool is not acceptable on a gift item.

Send it before the inspection is bookedAn inspector reading it on the day has already lost time.

Understanding the AQL Numbers

Acceptance sampling under ISO 2859-1 turns quality into a decision rule rather than an argument. Knowing the numbers lets you set the standard deliberately instead of accepting a default.

0 / 2.5 / 4.0Standard AQL tripletCritical / major / minor

~200 unitsSample at Level IIOn a 5,000-piece order

Accept 10At AQL 2.5, 200 sampleReject at 11 major defects

64% vs 98%Catch probabilityLevel I vs Level II on 1,000 units

Calipers measuring a product component on a workbench — Tolerances belong in the checklist as numbers, not adjectives.

Why Inspection Level Is a Real Decision

Level I costs less because it samples less, and the reduction in catch probability is not marginal. On a 1,000-unit order, Level I pulls 20 samples against Level II's 80, and the chance of catching a defective batch falls from 98% to 64%.

Level I on anything safety-related A one-in-three chance of missing a bad batch is not a risk profile, it is a gamble.
Level I on a new supplier You have no history to justify reducing the sample.
Documented cost of under-sampling Level I on electronics has an average failure cost near $22,000.
Level II as the sensible default Reduce it only with a supplier whose record actually earns the reduction.

Case: The Feature Nobody Tested

Buyer: Dutch outdoor-gear seller, 3,200 rechargeable lamps

The generic checklist tested power-on and brightness. It did not test the waterproof seal, because the client had not listed it. Roughly 8% of units leaked in the first month of sale. The revised checklist for the next order specified an immersion test with a stated duration and depth.

OutcomeThe second production run passed with two minor findings; the leak defect did not recur.

A barcode on retail packaging being scanned with a handheld reader — Labelling and barcode checks catch market-specific failures early.

The Golden Sample's Role in the Checklist

A checklist tells the inspector what to look at. A golden sample tells them what 'correct' looks like. Neither works properly without the other.

Send a sealed, signed, dated unitThe physical reference against which appearance is judged.

Keep an identical copy yourselfSo a later 'improved' sample cannot redefine the standard.

Reference it in the checklistExplicitly, so appearance findings cite the sample.

Update it when the spec changesAn outdated reference causes false failures.

How RND SOURCING Builds a Checklist

We start from the client's own complaint and return history rather than a template, because that is where the real defect list lives. Tolerances go in as numbers, market-specific labelling requirements are written out, and the AQL level is set deliberately rather than defaulted. The checklist and the sealed golden sample reach the inspector before the booking is confirmed. For products with a safety-critical feature we push clients towards Level II sampling even when Level I is cheaper, and we say plainly that we are not a testing laboratory.

Build a PSI checklist with us

RND SOURCING — Yiwu, Zhejiang, China. Written by our sourcing desk from first-hand market work.