TS 2756-5 ISO 8422

TS 2756-5 ISO 8422 is the standard for sequential sampling plans used in inspection by attributes. Instead of judging a lot from a single fixed sample, sequential inspection allows results to accumulate until the evidence is sufficient to accept, reject, or continue sampling. The technical focus is therefore on decision-making by stages, where each additional observation changes the strength of the case for or against the lot.

How sequential inspection works in attribute control

In attribute inspection, items are classified rather than measured on a continuous scale. Common examples in general technical practice include conforming/nonconforming, pass/fail, or defect/no defect decisions. Sequential plans convert those observations into a statistical decision process. Their main practical value is that many lots can be decided with fewer inspected items than a conventional fixed-sample approach, while still keeping the inspection logic systematic.

What this standard covers

According to the supplied scope, this standard covers sequential sampling plans for inspection by attributes, and it is identified as equivalent to ISO 8422:1991. It sits within the broader family of sampling for inspection and testing, but it is specifically concerned with sequential plans rather than single-stage or multi-stage alternatives. In practice, that distinction matters because the decision rule evolves during inspection instead of being based on one preselected sample size.

• Sequential decision structures for attribute-based inspection
• Progressive evaluation toward accept, reject, or continue decisions
• Statistical sampling methods used in inspection and testing
• Turkish standard issued as equivalent to ISO 8422:1991