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the opening sentence says 'also known as Shewhart charts'. That's incorrect; Shewhart's chart is just one of several types of control chart (consider cusum, manhattan, moving range, moving average etc).
I'd suggest _either_ removing this from the intro and covering different chart types in separate subsections _or_ re-titling the article 'Shewhart chart' and linking to other articles for other QC chart types. — Preceding unsigned comment added by Slrellison (talk • contribs) 18:36, 19 February 2022 (UTC)[reply]
