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Quality and Statistics Committee Develops Standard for Control Charts
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 December 2007
Tech News

Quality and Statistics Committee Develops Standard for Control Charts

A new standard recently approved by ASTM International Committee E11 on Quality and Statistics provides guidance for the use of control charts in the field of statistical quality control. Control charts are used to monitor product or process characteristics to determine whether or not a process is in a state of statistical control. The new standard, E 2587, Practice for Use of Control Charts, is under the jurisdiction of Subcommittee E11.30 on Data Analysis.

According to Thomas Murphy, leader of the E 2587 task group and an independent consultant, while Committee E11 has a manual, Manual 7A, that serves as a reference on control chart methodology, the manual does not have the force of a standard. Practice E 2587 will serve this need, while the manual will continue to serve as a reference source.

In addition, E 2587 will complement an existing E11 standard, E 2281, Practice for Process and Measurement Capability Indices. The concepts of the two standards are linked, because a process must be in a state of statistical control before process capability analysis is valid. E 2587 will also support another recently approved E11 standard that uses control charts, E 2554, Practice for Estimating and Monitoring the Uncertainty of Test Results of a Test Method in a Single Laboratory Using a Control Sample Program.

Murphy says that anyone who owns a process (a set of interrelated activities that converts input into outputs) and wishes to improve the quality of the output from that process will find E 2587 beneficial. He also notes that, among other types, processes may include those dealing with manufacturing, testing and services.

“We are always seeking participation on Subcommittee E11.30 from new members,” says Frank Sinibaldi, chair of E11.30. Possible future additions to E 2587 include charts on Cusum, EWMA, acceptance control, multivariate and time-to-events. Anyone with experience in use of control charts is encouraged to participate in E11.30 standards developing activities. //

CONTACT

Technical Information: Thomas Murphy, T.D. Murphy Statistical Consulting, LLC
Phone: 973/292-0637

ASTM Staff: Christine Sierk
Phone: 610/832-9728