There’s a new ISO 22514-7:2012, “Statistical methods in process management – Capability and performance – Part 7: Capability of measurement processes,” and it’s available now from Document Center Inc. This new 54-page standard defines a procedure to validate measuring systems and a measurement process in order to state whether a given measurement process can satisfy the requirements for a specific measurement task with a recommendation of acceptance criteria. The acceptance criteria are defined as a capability figure or a capability ratio.
ISO 22514-7 follows the approach taken in ISO/IEC Guide 98-3, “Guide to the expression of the uncertainty in measurement (GUM),” and establishes a basic, simplified procedure for stating and combining uncertainty components used to estimate a capability index for an actual measurement process. It was developed to be used for simple one-dimensional measurement processes, where it is known that the method uncertainty and the specification uncertainty are small compared to the implementation uncertainty.
The balance of the ISO 22514 series, “Statistical methods in process management — Capability and performance,” are:
— ISO 22514-1: General principles and concepts
— ISO-22514-2: Process capability and performance of time-dependent process models
— ISO-22514-3: Machine performance studies for measured data on discrete parts
— ISO-22514-4: Process capability estimates and performance measures
— ISO-22514-5: Process capability and performance for attributive characteristics and
— ISO-22514-6: Process capability statistics for characteristics following a multivariate normal distribution.
Several parts are still in process. Part 2 and Part 6 are currently draft documents, with Part 6 due to be published soon. Part 8 is still a committee draft and Part 5 on process capability and performance for attributive characteristics is in the works.
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