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.”
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