NBN ISO 28591:2020

NBN ISO 28591:2020

Sequential sampling plans for inspection by attributes

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Detalles

This International Standard specifies sequential sampling plans and procedures for inspection by

attributes of discrete items.

The plans are indexed in terms of the producer's risk point and the consumer's risk point. Therefore,

they can be used not only for the purposes of acceptance sampling, but for a more general purpose of

the verification of simple statistical hypotheses for proportions.

The purpose of this International Standard is to provide procedures for sequential assessment of

inspection results that may be used to induce the supplier, through the economic and psychological

pressure of non-acceptance of lots of inferior quality, to supply lots of a quality having a high probability

of acceptance. At the same time, the consumer is protected by a prescribed upper limit to the probability

of accepting lots of poor quality.

This International Standard provides sampling plans that are applicable, but not limited, to inspection

in different fields, such as:

? end items,

? components and raw materials,

? operations,

? materials in process,

? supplies in storage,

? maintenance operations,

? data or records, and

? administrative procedures.

This International Standard contains sampling plans for inspection by attributes of discrete items.

The sampling plans may be used when the extent of nonconformity is expressed either in terms of

proportion (or percent) nonconforming items or in terms of nonconformities per item (per 100 items).

The sampling plans are based on the assumption that nonconformities occur randomly and with

statistical independence. There may be good reasons to suspect that one nonconformity in an item

could be caused by a condition also likely to cause others. If so, it would be better to consider the items

just as conforming or not, and ignore multiple nonconformities.

The sampling plans from this International Standard should primarily be used for the analysis of

samples taken from processes. For example, they may be used for the acceptance sampling of lots taken

from a process that is under statistical control. However, they may also be used for the acceptance

sampling of an isolated lot when its size is large, and the expected fraction nonconforming is small

(significantly smaller than 10 %).

In the case of the acceptance sampling of continuing series of lots, the system of sequential sampling

plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection published in ISO 2859-5 should

be applied.

Información adicional

Autor Bureau de Normalisation Belge (NBN)
Publicado por NBN
Tipo de Documento Norma
ICS 03.120.30 : Aplicación de métodos estadísticos
histórico No
Palabra clave ISO 28591, ISO 28591:2020
Formulario de pedido