AAOM Handbook

INTERNAL

MP.15 Document the measurement system

Context

A measurement system is used to provide high quality, reliable data to produce control charts and capability histograms so that good decisions can be made about the need to intervene in the process. A measurement system will include the combined input of the following to produce a set of procedures that will ensure a reliable collection of data:

• The process being measured • The purpose of the process

• The theory underpinning the process • The purpose and theory measures • The physical boundaries of the process • The measurement (data) boundaries for each measure • The owner of each measure

• The collection of measures to be used as a KPI • The target and specification limits for each measure • A list of the measurement devices showing each gauge’s capability • The maximum throughput of the process • The required level of measurement accuracy required to adequately identify significant variation • The sampling interval for each measure

Purpose

To define a measurement system that conditions the data before capturing and recording data at the specified sampling interval and accuracy.

Quantity One procedure for collecting data for each measure shall be delivered for the specified measures: • One specification for the boundary conditions to be applied to the measure. • One specification for the conditioning filter to be applied to the measure. • One specification for the measurement accuracy at which data is to be collected. • One specification for the sampling interval at which data is to be collected. • One Control Chart of the performance. • One Capability Histogram of the performance.

Quality

It is critical that the sample intervals be strictly adhered to or the data will not accurately represent the true variation.

© McAlear Management Consultants 2007

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