ISO 21747-2006 PDF

Full title and description

Statistical methods — Process performance and capability statistics for measured quality characteristics. This International Standard specifies procedures and formulae for determining process performance and capability statistics for continuous (measured) quality characteristics, including categorization of process results into several distribution types and calculation of capability indicators for industrial and economic processes.

Abstract

ISO 21747:2006 describes a procedure for the determination of statistics to estimate the quality capability of product and process characteristics. It tabulates process results into a set of distribution types (eight categories) and provides calculation formulae for the associated performance and capability statistics for continuous quality characteristics, applicable across industrial and economic sectors.

General information

• Status: Withdrawn / superseded.
• Publication date: July 2006 (Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 03.120.30 (Application of statistical methods).
• Edition / version: Edition 1 (2006).
• Number of pages: 32.

Scope

Applies to the determination of process performance and capability statistics for continuous (measured) quality characteristics. The standard defines a procedure for classifying process outcome distributions into defined types (eight possible distribution forms) and gives formulae to calculate relevant capability and performance indices. It is intended for use across any industrial or economic sector where continuous quality measurements are collected and analysed.

Key topics and requirements

• Definitions and statistical concepts for process performance and capability relevant to continuous characteristics.
• Classification of process-result distributions into eight distribution types and guidance on selection.
• Calculation formulae for capability and performance statistics (indices and measures) associated with each distribution type.
• Procedures to estimate capability from measured data and considerations for application across sectors.
• Guidance intended to be compatible with subsequent revisions and successor parts in the ISO 22514 series.

Typical use and users

Used by quality engineers, process-improvement specialists, industrial statisticians, manufacturing engineers, and organizations performing capability studies and statistical process control (SPC). Typical applications include capability assessment during production acceptance, process diagnostics, and continual improvement programs where continuous measurement data are analysed.

Related standards

ISO 21747:2006 has been withdrawn and its methods were incorporated into the ISO 22514 series on statistical methods in process management — Capability and performance (notably replaced by ISO 22514-2). Other related parts of the ISO 22514 series (general principles, multivariate cases, attribute characteristics, measurement capability, etc.) provide complementary guidance for broader or more specific capability analyses.

Keywords

process capability, process performance, capability indices, continuous quality characteristics, statistical methods, distribution classification, SPC, capability study.

FAQ

Q: What is this standard?

A: ISO 21747:2006 is an ISO International Standard that specified statistical procedures and calculation methods for assessing process performance and capability for measured (continuous) quality characteristics.

Q: What does it cover?

A: It covers classification of process-result distributions (eight distribution types), and provides formulae and procedures to compute performance and capability statistics for continuous measurements, applicable across industrial and economic sectors.

Q: Who typically uses it?

A: Quality engineers, statisticians, manufacturing and process engineers, and organizations conducting capability studies, SPC programs, or process acceptance evaluations.

Q: Is it current or superseded?

A: ISO 21747:2006 has been withdrawn and superseded; its content was incorporated into the ISO 22514 series, with ISO 22514-2 published subsequently as the replacement for process capability and performance guidance.

Q: Is it part of a series?

A: Yes — its subject matter now sits within the ISO 22514 series (Statistical methods in process management — Capability and performance), which contains multiple parts addressing general principles, multivariate and attribute characteristics, measurement capability, and related topics.

Q: What are the key keywords?

A: Process capability, process performance, capability indices, continuous characteristics, statistical process control, distribution types, capability study.