ISO 22514-1:2014

Overview

ISO 22514-1:2014, "Statistical methods in process management - Capability and performance - Part 1: General principles and concepts," defines the fundamental principles for assessing process capability and process performance in manufacturing and related production contexts. The standard provides guidance on when and how to conduct capability studies to determine whether process output or production equipment meets specified criteria. It is a general, non-formulaic foundation intended to be used alongside the more specific parts of ISO 22514.

Key Topics and Requirements

The standard addresses essential technical topics and practical requirements without prescribing specific formulae:

• Scope and definitions: clear terms for process, characteristic, product, quality, capability and performance.
• Pre-conditions for application: considerations for establishing specifications, distributional assumptions, and sample size guidance.
• Data collection and integrity: requirements for traceability of data, measurement uncertainty, data recording, and handling of outliers.
• Types of studies: differentiation between machine performance, process performance, position performance, and measurement process capability.
• Analysis framework: identification of stationary vs. non‑stationary processes, stochastic process indexing, and methods for deciding when a capability study is required.
• Performance and capability indices: conceptual presentation of indices used to evaluate conformity with specifications (concepts only; detailed calculations appear in other parts of ISO 22514).
• Results, benefits and limitations: guidance on interpreting study outcomes, expected benefits, and recognized limitations of capability studies.

Practical Applications

ISO 22514-1 is practical for organizations using statistical methods to control and improve manufacturing processes:

• Quality control and production acceptance: determine whether product characteristics meet specifications prior to shipment or acceptance.
• Problem solving and diagnosis: use capability/performance studies to identify causes of variation and areas for process improvement.
• Supplier management: provide objective evidence that supplier outputs satisfy agreed specifications.
• Audit and compliance: support internal and external audits for conformity with product requirements.
• Measurement system assessment: frame studies that account for measurement uncertainty and measurement process capability.

Who Should Use This Standard

• Quality engineers and process engineers
• Statistical analysts and Six Sigma practitioners
• Supplier quality managers and auditors
• Production managers evaluating machine or process performance

Related Standards

ISO 22514-1 is the introductory part of the ISO 22514 series. See related parts for detailed methods:

• ISO 22514-2, -3, -4 (TR), -6, -7, -8 and planned parts addressing time-dependent models, discrete parts, multivariate/multistate issues and measurement process capability.

Keywords: ISO 22514-1:2014, process capability, process performance, statistical methods, capability study, measurement uncertainty, quality control, manufacturing process.