Today I have been...
Reading about Statistical Process Control.
SPC is designed for solving problems related to "process variation".
For example, a process maybe unable to meet quality or accuracy standards desired or required. The concepts of Technical criticality (where a process fails to meet specifications resulting in defective products/services) and Statistical criticality (where a process is unstable or incapable of meeting its performance specifications).
SPC is a big topic in T889 and there is a question in TMA02 on it. Mason and Antony provide contextual information in S11.5 B3.
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