In order to monitor industrial processes, control charts are often employed. They are graphical displays of estimates of a key quality process parameter. It is said that a process is working under control when the estimates fall within the range delimited by control limits, which define feasible process values that guarantee high standard quality levels. In practice, a product may work even if its quality parameters lie outside the control limits, within a range delimited by the so-called specification limits, that is, those limits that guarantee a product to be delivered and sold to customers. In such cases, the product quality will not be excellent, nevertheless adequate. In this contribution, we will give a definition of specification limits and where they are used in statistical quality control.
Lingua originaleEnglish
Titolo della pubblicazione ospiteWiley StatsRef: Statistics Reference Online
Numero di pagine4
Stato di pubblicazionePubblicato - 2016


  • capability index
  • control charts


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