ISO 22514-5:2019 PDF

Name: ISO 22514-5:2019 — Statistical methods in process management — Capability and performance — Part 5: Process capability estimates and performance for attributive characteristics
SKU: ISO 22514-5:2019
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Statistical methods in process management — Capability and performance — Part 5: Process capability estimates and performance for attributive characteristics

Название (английский):

ISO 22514-5:2019

Statistical methods in process management — Capability and performance — Part 5: Process capability estimates and performance for attributive characteristics

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 9 августа 2019 г.
Издание:: ISO IS 22514 edition 1 version 1
ICS:: 03.120.30

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Описание (английский):

This document describes a method to calculate process capability and performance indices for attribute characteristics. This method can be used as a supplement to the commonly used capability calculations for variable characteristics.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 22514-5:2019 - part of the ISO 22514 series on statistical methods in process management - defines methods to estimate process capability and performance for attributive (attribute) characteristics. The standard describes how to calculate capability/performance indices when quality is expressed as counts or proportions (presence/absence, defect counts), complementing capability calculations for variable characteristics.

Key topics

Attribute data models: Assumes binomial (proportion/nonconforming units) or Poisson (count/nonconformities) models and requires monitoring a single parameter for stability.

Attribute control charts: Use of np, p, c and u charts to plot subgroup proportions or counts and to check statistical control before capability assessment.

Process quality level (Q): Defines Q as the centre-line (average level) of a stable attribute control chart (p, np, c or u), and gives procedures for estimating Q from samples or lot data.

Performance vs capability: Distinguishes process capability (requires statistical control) from process performance (no control-chart requirement). If the process is not in control, indices represent performance (P) rather than capability (C).

Indices and measures: Introduces indices for attributive characteristics (Pp, Ppk, etc.) and related metrics such as first run capability (FRC), nonconformities per hundred units (NHU) and nonconformities per million (NMU / ppm).

Confidence intervals and small-sample rules: Procedures for handling samples with no nonconformities (use of one-sided confidence limits) and for estimating upper confidence limits on Q when d = 0 or small d. Example: n = 200 with no defects → upper confidence limit Q ≈ 1.5% (illustrative in the standard).

Preconditions: Guidance on sample size, subgrouping, specification definitions and treating production lines or locations separately.

Applications

Estimating capability and performance when characteristics cannot be measured continuously (e.g., pass/fail checks, defect counts, visual inspections).

Supplier evaluation and incoming quality assessment where attribute data are predominant.

First-run capability estimates and production release decisions using NHU or ppm measures.

Quality system monitoring in manufacturing, healthcare, software QA, inspection processes and audits that rely on attribute sampling.

Related standards

ISO 22514 series (other parts cover variable characteristics and related methods)

ISO 3534-2 (statistics - vocabulary and symbols)

ISO 7870 series (control charts) and ISO 22514-7 (measurement uncertainty) are referenced for charting and specification aspects.

Keywords: ISO 22514-5, process capability, attributive characteristics, attribute control chart, process performance, NHU, FRC, p-chart, np-chart, c-chart, u-chart, nonconforming units.

ISO 22514-5:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics

Applications

Who should use it

Related standards

Технические детали

BS ISO 22514-2:2026

Statistical methods in process management — Capability and performance. Process capability and performance of…

BS ISO 3534-2:2006

Statistics. Vocabulary and symbols. Applied statistics.

SIST ISO 7870-1:2020

Control charts - Part 1: General guidelines

ISO 22514-7:2021/Amd 1:2024

Statistical methods in process management — Capability and performance — Part 7: Capability of measurement pr…

BS ISO 22514-5:2019

Statistical methods in process management. Capability and performance. Process capability estimates and perfo…