Sampling can help evaluate a lot without examining every unit, but its meaning depends on the agreed plan. A report that says several pieces were checked is not the same as a defined acceptance-sampling procedure. Ask the inspection provider to explain the basis and limitations of the proposed scope.
Define the decision
State the lot size, product types and characteristics to be evaluated. Explain which defects would make the goods unusable or create a serious concern. Let an appropriately qualified provider propose the plan and document its acceptance criteria before the visit, rather than choosing a convenient percentage after seeing the results.
Account for mixed products
A shipment of several door models and finishes may require a different approach from one uniform product. Ask how samples will be distributed across models, cartons and batches. Custom items may also need specific dimensional checks beyond a general sampling plan.
Questions for the provider
- How are units selected and how is selection recorded?
- What happens if part of the lot is unavailable?
- Which checks apply to every selected unit?
- How are failures, limitations and reinspection handled?
Do not describe a sampled pass as a guarantee covering all units. Use the report alongside production records, approved specifications and the consequences of a defect. Sampling is one part of the quality decision, not a substitute for defining what was ordered.
AN Sourcing buying notes. These are practical procurement checklists; specifications, service scope and destination requirements should be confirmed for the actual order.