Tag: ISO 7870-4

New ISO 7870-2 standard released on Shewhart Control Charts

Another ISO standard in the 7870 series on Control Charts has been released.  The new ISO 7870-2 1st Edition, “Control charts – Part 2: Shewhart control charts,” is available now.  This first edition establishes a guide to the use and understanding of the Shewhart control chart approach to the methods for statistical control of a process.

Control charts were initially proposed by Dr. Walter Shewhart in 1924.  They are a graphical means to compare the actual state of a process against a predetermined process capability.  They are used to detect unnatural patterns of variation in the process, which allows for the identification of problems and of ways to make improvements.

While the new ISO 7870-2 covers only the Shewhart system of charts, the ISO 7870 series itself covers Control charts in general.  There are currently four accepted standards, one draft and one additional part in the works.  Here’s the list:

Additionally, ISO 7870-5, “Control charts — Part 5: Specialized control charts,” is in draft format at this time, while an additional ISO 7870-6 covering EWMA control charts is also planned.  FYI: ISO 7870-2 replaces the now obsolete ISO 8258:1991.

All current ISO standards (as well as many obsolete editions) can be purchased on Document Center’s website, www.document-center.com.  Or contact us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  Territorial restrictions may apply.

New ISO 7870-4 released on Control charts — Part 4: Cumulative sum charts

ISO 7870-4:2011, “Control charts — Part 4: Cumulative sum charts,” has just been released.  It’s the latest addition to the series that replaces the obsolete ISO 7870:1997 standard.  These standards cover the principles of control charting and include guidance on the preparation and interpretation of control charts using basic decision rules.

The series when complete will present key elements and philosophy of the control chart approach, and identify a wide variety of control charts, including those related to the Shewhart control chart, the acceptance control chart and the adaptive control chart.  They will also present an overview of the basic principles and concepts and illustrate the relationship among various control chart approaches to aid in the selection of the most appropriate standard for given circumstances.

The 63 page ISO 7870-4 2011 edition provides statistical procedures for setting up cumulative sum (cusum) schemes for process and quality control using variables (measured) and attribute data. It describes general-purpose methods of decision-making using cumulative sum (cusum) techniques for monitoring, control and retrospective analysis.

The companion standard, ISO 7870-1:2007, “Control charts — Part 1: General guidelines,” covers key elements and philosophy of the control chart approach, and identifies a wide variety of control charts (including those related to the Shewhart control chart and those stressing process acceptance or on-line process adjustment).

ISO 7870-1 presents an overview of the basic principles and concepts and illustrates the relationship among various control chart approaches to aid in the selection of the most appropriate standard for given circumstances. It does not specify statistical control methods using control charts.

The ISO committee TC69 is currently working on two additional parts: ISO 7870-2, “Control charts — Part 2: Shewhart control charts,” and ISO 7870-3, “Control charts — Part 3: Acceptance control charts.”

To purchase these standards, other standards on statistical quality control, or any standards from ISO, please use our website at www.document-center.com.  Or you can contact Document Center staff by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  We have been assisting customers with their quality standards requirements since 1982.