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Control chart design a review of standard practice
Author(s) -
Porter Leslie J.,
Caulcutt Roland
Publication year - 1992
Publication title -
quality and reliability engineering international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 62
eISSN - 1099-1638
pISSN - 0748-8017
DOI - 10.1002/qre.4680080207
Subject(s) - control chart , shewhart individuals control chart , statistical process control , computer science , chart , process (computing) , control (management) , simple (philosophy) , reliability engineering , engineering , statistics , ewma chart , mathematics , artificial intelligence , philosophy , epistemology , operating system
Many standard texts on SPC offer simple procedures for setting up control charts. Although the procedures work well in some situations, there are many instances where the procedures do not produce useful charts. The failure to sustain SPC initiatives is often due to an over simplistic model of process variability. This paper examines the widely used procedures for setting up control charts and illustrates how these may fail when the process variability has certain characteristics. A more robust alternative procedure is examined in some detail. This involves taking a closer look at process variability and incorporating this with control chart design.