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:
- ISO 7870-1:2007, “Control charts — Part 1: General guidelines”
- ISO 7870-2:2013, “Control charts — Part 2: Shewhart control charts”
- ISO 7870-3:2012, “Control charts — Part 3: Acceptance control charts”
- ISO 7870-4:2011, Control charts — Part 4: Cumulative sum charts”
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.
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